feat: o3 level optimization for image diffing (#443)

## Summary

Replace the CMake-compiled C native library with prebuilt `.so` binaries
in the Android SDK, pin additional AndroidX Lifecycle dependencies in
the MAUI NuGet packages, and bump the MAUI SDK version to 0.5.2.

## Changes

### Android SDK (`observability-android`)

- **Switch from CMake source compilation to prebuilt `.so` binaries**:
Removed all C source files (`tile_hash.c`, `tile_hash.h`,
`tile_hash_jni.c`, `nearest_divisor.c`, `nearest_divisor.h`) and the
`externalNativeBuild { cmake { ... } }` block from `build.gradle.kts`.
Added prebuilt `libsession_replay_c.so` binaries under `jniLibs/` for
all four ABIs: `arm64-v8a`, `armeabi-v7a`, `x86`, `x86_64`. This
eliminates the CMake/NDK build dependency and ensures consistent binary
output across environments.
- **Rename native library**: Updated `TileHashNative.kt` to load
`session_replay_c` instead of the old `tile_hash` library name.

### MAUI / .NET SDK (`mobile-dotnet`)

- **Pin additional AndroidX Lifecycle dependencies**: Added
`Xamarin.AndroidX.Lifecycle.LiveData` and
`Xamarin.AndroidX.Lifecycle.ViewModelSavedState` at `[2.9.2.1, 3.0.0)`
in both `LDObservability.csproj` and `LDObservability.Fat.csproj` to
prevent NU1608 version-mismatch warnings in consumer projects.
- **Version bump to 0.5.2** in `Directory.Build.props`.

## Test Plan

- [ ] Build Android SDK — verify it compiles without CMake/NDK and the
prebuilt `.so` files are bundled correctly in the AAR
- [ ] Run Android SDK on all ABIs (arm64-v8a, armeabi-v7a, x86, x86_64)
— verify `TileHashNative` loads `libsession_replay_c.so` successfully
- [ ] Build MAUI SDK — verify no NU1608 dependency warnings
- [ ] Run session replay on Android via MAUI — verify tile hashing works
end-to-end


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Switches Android session-replay hashing from source-built JNI
(CMake/NDK) to bundled prebuilt `.so` binaries and renames the loaded
library, which can impact runtime loading/ABI compatibility. Additional
AndroidX pinning and a package version bump are low risk but may affect
downstream dependency resolution.
> 
> **Overview**
> Moves Android session replay tile-hashing from a CMake/NDK-built JNI
library to **prebuilt native binaries**: removes the CMake build
configuration and deletes the C sources/JNI glue, relies on packaged
`libsession_replay_c.so` under `jniLibs/` for all ABIs, and updates
`TileHashNative` to load `session_replay_c`.
> 
> Updates the .NET MAUI NuGet packaging by bumping
`LaunchDarkly.SessionReplay` to `0.5.2` and pinning additional AndroidX
Lifecycle dependencies (`LiveData`, `ViewModelSavedState`, and aligned
`LiveData.Core`) to reduce consumer version-conflict warnings.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
b5239b4. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: abelonogov-ld

sdk/@launchdarkly/mobile-dotnet/observability/Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
 	<PropertyGroup>
 		<PackageId>LaunchDarkly.SessionReplay</PackageId>
-		<Version>0.5.0</Version>
+		<Version>0.5.2</Version>
 		<UseLocalClientSdk>false</UseLocalClientSdk>
 		<Authors>LaunchDarkly</Authors>
 		<Owners>LaunchDarkly</Owners>

sdk/@launchdarkly/mobile-dotnet/observability/LDObservability.Fat.csproj

@@ -34,10 +34,12 @@
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Runtime.Ktx" Version="[2.9.2.1, 3.0.0)" />
 		<!-- Keep Common, LiveData.Core, and Process aligned with Runtime to avoid NU1608 in consumers. -->
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Common" Version="[2.9.2.1, 3.0.0)" />
+		<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="[2.9.2.1, 3.0.0)" />
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData.Core" Version="[2.9.2.1, 3.0.0)" />
 		<!-- Keep LiveData.Core.Ktx aligned with LiveData.Core to avoid duplicate LiveDataKt classes. -->
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData.Core.Ktx" Version="[2.9.2.1, 3.0.0)" />
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Process" Version="[2.9.2.1, 3.0.0)" />
+		<PackageReference Include="Xamarin.AndroidX.Lifecycle.ViewModelSavedState" Version="[2.9.2.1, 3.0.0)" />
 
 		<!-- MAUI requires AndroidX.SavedState.ISavedStateRegistryOwner to exist in Xamarin.AndroidX.SavedState.dll.
 		     Xamarin.AndroidX.SavedState 1.3.0 is missing that type in the main assembly, but 1.3.1.1 has it again. -->

sdk/@launchdarkly/mobile-dotnet/observability/LDObservability.csproj

@@ -32,10 +32,12 @@
 		<!-- Keep Lifecycle Runtime/Ktx aligned to avoid duplicate FlowExtKt between runtime-android and runtime-ktx. -->
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Runtime" Version="[2.9.2.1, 3.0.0)" />
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Runtime.Ktx" Version="[2.9.2.1, 3.0.0)" />
-		<!-- Keep Common, LiveData.Core, and Process aligned with Runtime to avoid NU1608 in consumers. -->
+		<!-- Keep Common, LiveData, LiveData.Core, Process, and ViewModelSavedState aligned with Runtime to avoid NU1608 in consumers. -->
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Common" Version="[2.9.2.1, 3.0.0)" />
-		<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData.Core" Version="[2.9.0, 3.0.0)" />
+		<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData" Version="[2.9.2.1, 3.0.0)" />
+		<PackageReference Include="Xamarin.AndroidX.Lifecycle.LiveData.Core" Version="[2.9.2.1, 3.0.0)" />
 		<PackageReference Include="Xamarin.AndroidX.Lifecycle.Process" Version="[2.9.2.1, 3.0.0)" />
+		<PackageReference Include="Xamarin.AndroidX.Lifecycle.ViewModelSavedState" Version="[2.9.2.1, 3.0.0)" />
 		<PackageReference Include="Xamarin.AndroidX.SavedState" Version="[1.3.1.1, 2.0.0)" />
 		<PackageReference Include="Xamarin.AndroidX.SavedState.SavedState.Ktx" Version="[1.3.1.1, 2.0.0)" />
 	</ItemGroup>

sdk/@launchdarkly/observability-android/lib/build.gradle.kts

@@ -92,12 +92,6 @@ android {
         buildConfigField("String", "OBSERVABILITY_SDK_VERSION", "\"${project.version}\"")
     }
 
-    externalNativeBuild {
-        cmake {
-            path = file("src/main/cpp/CMakeLists.txt")
-        }
-    }
-
     buildTypes {
         release {
             isMinifyEnabled = false