fix: remove global ref when invalidating module (#2914)

## Description

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Description and motivation for this PR.

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Fixes # .
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Right now, when removing React Native instance in brownfield apps, the
`ScreensModule` cpp side is kept in memory until the whole app is
killed. This code removes global ref when invalidating the module too.
It fixes memleaks e.g. in Expensify App.

## Changes

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overview, if change is simple you can omit this section.

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- Updated `about.md` docs

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## Test code and steps to reproduce

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You'd need brownfield app so no repro attached. Try remove and add RN
instance to native android app a couple of times, then do a heap dump in
AS and check for `ScreensModule` instances with 0 depth in its
references.

## Checklist

- [ ] Included code example that can be used to test this change
- [ ] Updated TS types
- [ ] Updated documentation: <!-- For adding new props to native-stack
-->
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/guides/GUIDE_FOR_LIBRARY_AUTHORS.md
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/native-stack/README.md
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/src/types.tsx
- [ ]
https://github.com/software-mansion/react-native-screens/blob/main/src/native-stack/types.tsx
- [ ] Ensured that CI passes

Author: WoLewicki

android/src/main/cpp/jni-adapter.cpp

@@ -94,6 +94,16 @@ Java_com_swmansion_rnscreens_ScreensModule_nativeInstall(
       std::move(rnScreensModuleHostObject));
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_swmansion_rnscreens_ScreensModule_nativeUninstall(
+        JNIEnv *env,
+        jobject thiz) {
+    if (globalThis != nullptr) {
+        env->DeleteGlobalRef(globalThis);
+        globalThis = nullptr;
+    }
+}
+
 void JNICALL JNI_OnUnload(JavaVM *jvm, void *) {
   JNIEnv *env;
   if (jvm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6) != JNI_OK) {

android/src/main/java/com/swmansion/rnscreens/ScreensModule.kt

@@ -35,6 +35,13 @@ class ScreensModule(
 
     private external fun nativeInstall(jsiPtr: Long)
 
+    private external fun nativeUninstall()
+
+    override fun invalidate() {
+        super.invalidate()
+        nativeUninstall()
+    }
+
     override fun initialize() {
         super.initialize()
         if (BuildConfig.IS_NEW_ARCHITECTURE_ENABLED) {