feat: rename podspecs to umbrella + ObjC core

[denischilik]

Summary

Restructures CocoaPods so the public pod mParticle-Apple-SDK matches the Swift umbrella (same module as SPM product mParticle-Apple-SDK), and introduces mParticle-Apple-SDK-ObjC for the ObjC core.

Changes

• mParticle-Apple-SDK.podspec: Swift umbrella sources; depends on mParticle-Apple-SDK-ObjC + RoktContracts.
• mParticle-Apple-SDK-ObjC.podspec: ObjC core (former root podspec content); module_name unchanged (mParticle_Apple_SDK_ObjC).
• Removed mParticle-Apple-SDK-Umbrella.podspec (content folded into root podspec).
• Updated release workflows, Scripts/release.sh, AGENTS.md, and Xcode project references.
• Trunk push order: Swift → ObjC → umbrella.

Kit podspecs can keep depending on mParticle-Apple-SDK; ObjC remains transitive.

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PR Summary

Medium Risk
Medium risk because it changes CocoaPods packaging/publish order and updates kit imports, which can break downstream consumers or CI linting if module names/dependencies are mismatched.

Overview
Restructures CocoaPods distribution into a Swift umbrella + ObjC core. The root mParticle-Apple-SDK.podspec is repurposed to ship only Swift umbrella sources and now depends on a new mParticle-Apple-SDK-ObjC.podspec, which contains the former ObjC core spec (and depends on mParticle-Apple-SDK-Swift).

Updates build/release automation to match the new pod layout. CI pod lint steps now include all three podspecs, release drafting bumps the new ObjC podspec version, and publishing pushes podspecs in dependency order (Swift pod → ObjC core → umbrella).

Aligns kits with the new module/import boundaries. Many kits’ ObjC headers/tests switch from conditional mParticle.h includes to @import mParticle_Apple_SDK_ObjC;, SPM ObjC example apps include <mParticle_Apple_SDK.h>, and a couple kit Xcode projects enable modules to support the module imports.

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[github-actions]

📦 SDK Size Impact Report

Measures how much the SDK adds to an app's size (with-SDK minus without-SDK).

Metric	Target Branch	This PR	Change
App Bundle Impact	1.75 MB	1.75 MB	+N/A
Executable Impact	848 bytes	848 bytes	+N/A
XCFramework Size	6.38 MB	6.38 MB	+N/A

➡️ SDK size impact change is minimal.

Raw measurements

Target branch (main):

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1880,"with_sdk_executable_size_bytes":76312,"sdk_impact_kb":1796,"sdk_executable_impact_bytes":848,"xcframework_size_kb":6532}

This PR:

{"baseline_app_size_kb":84,"baseline_executable_size_bytes":75464,"with_sdk_app_size_kb":1880,"with_sdk_executable_size_bytes":76312,"sdk_impact_kb":1796,"sdk_executable_impact_bytes":848,"xcframework_size_kb":6532}

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