feat: jnigen / jni 0.15, remove unused android classes form codegen

[josxha]

Tasks

• jni / jnigen 0.15.0
• use new jnigen config file
• use single file output for jnigen
• remove unused jnigen classes
• objective_c 9
• ffigen 20
• use new ffigen config file

Superseeds PRs

• build(deps): bump org.jetbrains.kotlin.android from 2.1.20 to 2.1.21 in /example/android in the dependencies group across 1 directory #405
• feat: ffigen v20, objective_c v9 #375

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[Copilot]

Pull Request Overview

This PR updates jni/jnigen to version 0.15.0 and removes unused Android classes from code generation, resulting in a cleaner and more maintainable codebase.

• Updates jni and jnigen dependencies to version 0.15.0
• Migrates to new jnigen configuration file format and single-file output
• Removes unused auto-generated Android JNI bindings
• Updates Android platform functions to use new jni 0.15 APIs

Reviewed Changes

Copilot reviewed 43 out of 227 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
maplibre/lib/src/platform/android/jni/org/maplibre/android/camera/CameraUpdate.dart	Removed unused CameraUpdate JNI bindings
maplibre/lib/src/platform/android/jni/org/maplibre/android/camera/CameraPosition.dart	Removed unused CameraPosition JNI bindings
maplibre/lib/src/platform/android/jni/org/maplibre/android/attribution/*.dart	Removed unused attribution-related JNI bindings
maplibre/lib/src/platform/android/jni/org/maplibre/android/MapLibre.dart	Removed unused MapLibre JNI bindings
maplibre/lib/src/platform/android/jni/java/net/*.dart	Removed unused URL and URI JNI bindings
maplibre/lib/src/platform/android/jni/io/flutter/plugin/platform/*.dart	Removed unused Flutter platform view JNI bindings
maplibre/lib/src/platform/android/jni/io/flutter/plugin/common/PluginRegistry.dart	Removed unused plugin registry JNI bindings
maplibre/lib/src/platform/android/jni/com/github/josxha/maplibre/*.dart	Removed unused custom FlutterApi JNI bindings
maplibre/lib/src/platform/android/jni.dart	Removed exports for deleted JNI binding files
maplibre/lib/src/platform/android/functions.dart	Updated to use new jni 0.15 APIs for Context and Activity retrieval

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