[FEATURE] Allow selecting WebView implementation

[veitw]

Would it be possible to select the WebView component's implementation in the app's settings?

I got an Android 6 device with an ancient version (v44) of com.android.webview, which is unable to render the Home Assistant interface.
I installed com.google.android.webview v105 and also tried v107 beta, which are the latest versions available for Android 6, but switching the webview implementation from com.android.webview to com.google.android.webview globally via Android developer settings or adb shell cmd webviewupdate set-webview-implementation is only available on Android 7 and newer, so I depend on the app to select the WebView implementation.