[Android] Make ReactWebView & Client protected

[cbrevik]

I'd like to make ReactWebView and ReactWebViewClientprotected instead of private, inside the ReactWebViewManager class. The reason being that if you extend the ReactWebViewManager it'll be much easier to override existing logic.

In my specific case I'd like to be able to override shouldOverrideUrlLoading inside ReactWebViewClient and handle custom URL schemes differently. See #10055.

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[cbrevik]

CC @satya164

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