[TIMOB-28183] Android: Add Ti.Media.requestPhotoGalleryPermissions() support

*Summary:* We should add the following methods on Android for parity with iOS... * [Ti.Media.requestPhotoGalleryPermissions()](https://docs.appcelerator.com/platform/latest/#!/api/Titanium.Media-method-requestPhotoGalleryPermissions) * [Ti.Media.hasPhotoGalleryPermissions()](https://docs.appcelerator.com/platform/latest/#!/api/Titanium.Media-method-hasPhotoGalleryPermissions) *Functionality:* On Android 9 and below, these methods should check if the app has WRITE_EXTERNAL_STORAGE permission. On Android 10 and above, these methods should always return true since we do not need write permission to save a photo/video to the gallery once [TIMOB-28059] has been implemented. Google documents this here... https://developer.android.com/training/camera/photobasics#TaskPath *Note:* Currently, Titanium app developers must use the [Ti.Filesystem.requestStoragePermissions()](https://docs.appcelerator.com/platform/latest/#!/api/Titanium.Filesystem-method-requestStoragePermissions) and [Ti.Filesystem.hasStoragePermissions()](https://docs.appcelerator.com/platform/latest/#!/api/Titanium.Filesystem-method-hasStoragePermissions) methods before saving to the gallery. This is okay, but we don't need to check for WRITE_EXTERNAL_STORAGE permission on Android 10 and above when saving to the gallery. We also don't want to change the [Ti.Filesystem.requestStoragePermissions()](https://docs.appcelerator.com/platform/latest/#!/api/Titanium.Filesystem-method-requestStoragePermissions) method's implementation since it's still needed in case you want to write to other locations on external storage.