[path_provider_android] Changes internal implementation to use JNI

[bparrishMines]

https://developer.android.com/guide/components/processes-and-threads

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[bparrishMines]

cc @stuartmorgan-g for early review

[bparrishMines]

@HosseinYousefi Have you seen this error on Windows for JNI:

Changed 65 dependencies!
10 packages have newer versions incompatible with dependency constraints.
Try `flutter pub outdated` for more information.
Building Windows application...                                 
Nuget.exe not found, trying to download or use cached version.
CMake Error at C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:218 (message):
  Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY
  JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
Call Stack (most recent call first):
  C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.19/Modules/FindPackageHandleStandardArgs.cmake:582 (_FPHSA_FAILURE_MESSAGE)
  C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.19/Modules/FindJNI.cmake:382 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
  flutter/ephemeral/.plugin_symlinks/jni/src/CMakeLists.txt:32 (find_package)


Building Windows application...                                    11.5s
Unable to generate build files

[HosseinYousefi]

This is similar to https://github.com/getsentry/sentry-dart/issues/3033

So I write what I wrote there here as well:

@HosseinYousefi maybe you can confirm

issue: we're using JNI on Android but also means Flutter Desktop targets are affected due to flutter's plugin system. we don't use any JNI api during runtime on Desktop -> will end users need java installed in that case on Desktop using the app?

End users don't need to have Java installed as long as we're not using JNI on Windows (which I assume we're not here).

This is an issue with Flutter's plugin system. You could technically spawn JVM and use package:jni on Windows. This will be solved once we use the newly introduced build hooks for building package:jni's native library instead. Sentry could pass a parameter to specify that it's only using JNI on android and not on desktop.

Originally posted by @HosseinYousefi in #3033

I can fix this by making the windows build show a warning instead of an error if it couldn't find JDK.

[stuartmorgan-g]

Oops, I lost a comment because GitHub won't let me save a comment on the deleted file for reason. I had this on the deleted Dart unit tests:

I would expect these tests to be moved to the integration test runner rather than removed, so that we are still unit testing how we handle specific responses to from the system layer.

[Piinks]

Greetings from stale PR triage! 👋 Is this change still on your radar?

[stuartmorgan-g]

The PR was blocked by jni breaking Windows, but I believe jni 0.15.2 resolves the blocker.