Add benchmark module

Still need to adjust the benchmark to sample decode regions more aligned
with the actual use case, and to add more image formats to the benchmark.

Author: Rodrigodd

benchmark/.gitignore

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+/build

benchmark/benchmark-proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
+
+-dontobfuscate
+
+-ignorewarnings
+
+-keepattributes *Annotation*
+
+-dontnote junit.framework.**
+-dontnote junit.runner.**
+
+-dontwarn androidx.test.**
+-dontwarn org.junit.**
+-dontwarn org.hamcrest.**
+-dontwarn com.squareup.javawriter.JavaWriter
+
+-keepclasseswithmembers @org.junit.runner.RunWith public class *

benchmark/build.gradle

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+plugins {
+    id 'com.android.library'
+    id 'androidx.benchmark'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'dev.mihon.image.decoder.benchmark'
+    compileSdk 34
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+
+    defaultConfig {
+        minSdk 23
+        targetSdk 34
+
+        testInstrumentationRunner 'androidx.benchmark.junit4.AndroidBenchmarkRunner'
+    }
+
+    testBuildType = "release"
+    buildTypes {
+        debug {
+            // Since debuggable can"t be modified by gradle for library modules,
+            // it must be done in a manifest - see src/androidTest/AndroidManifest.xml
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile("proguard-android-optimize.txt"), "benchmark-proguard-rules.pro"
+        }
+        release {
+            isDefault = true
+        }
+    }
+}
+
+dependencies {
+    implementation platform('org.jetbrains.kotlin:kotlin-bom:1.8.0')
+    androidTestImplementation 'androidx.test:runner:1.6.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.benchmark:benchmark-junit4:1.2.4'
+    androidTestImplementation(project(":library"))
+    // Add your dependencies here. Note that you cannot benchmark code
+    // in an app module this way - you will need to move any code you
+    // want to benchmark to a library module:
+    // https://developer.android.com/studio/projects/android-library#Convert
+
+}

benchmark/src/androidTest/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <!--
+      Important: disable debugging for accurate performance results
+
+      In a com.android.library project, this flag must be disabled from this
+      manifest, as it is not possible to override this flag from Gradle.
+    -->
+    <application
+        android:debuggable="false"
+        android:requestLegacyExternalStorage="true"
+        tools:ignore="HardcodedDebugMode"
+        tools:replace="android:debuggable" />
+</manifest>