Add missing font APIs

[afsalz]

Expose font loading APIs

Adds loadFont / unloadFont to DotLottiePlayer and DotLottieController, wired through JNI to the existing native dotlottie_load_font / dotlottie_unload_font C API (not previously exposed to Kotlin).

Lets callers register a font by name into ThorVG's global font registry before an animation loads.

Closes #126

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Latest commit: f155ba6

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[Copilot]

Pull request overview

This PR exposes process-wide font registration APIs to Kotlin/Java by wiring dotlottie_load_font / dotlottie_unload_font through the existing JNI bridge, enabling font-stripped animations to resolve text styles when loaded from in-memory data sources.

Changes:

• Added nativeLoadFont / nativeUnloadFont externals to the core JNI interface (com.lottiefiles.dotlottie.core.jni.DotLottiePlayer).
• Exposed public loadFont / unloadFont static APIs on com.dotlottie.dlplayer.DotLottiePlayer.
• Added matching convenience APIs on DotLottieController (Compose runtime) delegating to the player-level APIs.
• Implemented the corresponding JNI bridge functions and registered them via RegisterNatives.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
dotlottie/src/main/kotlin/com/lottiefiles/dotlottie/core/jni/DotLottiePlayer.kt	Declares new JNI externals for font load/unload.
dotlottie/src/main/kotlin/com/dotlottie/dlplayer/DotLottiePlayer.kt	Exposes public Kotlin/Java static loadFont / unloadFont wrappers returning Boolean success.
dotlottie/src/main/java/com/lottiefiles/dotlottie/core/compose/runtime/DotLottieController.kt	Adds Compose-side static convenience methods delegating to DotLottiePlayer.
dotlottie/src/main/cpp/jni_bridge.cpp	Implements and registers the new JNI methods calling the native C APIs.

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