Support for BrowserMatcher on Android

[ddfreiling]

Hi. My org would like to have this plugin support BrowserMatcher on Android, which makes it possible to decide which browser should be selected and used for logins. We're experiencing some callback issues with certain browsers, and would like to always select Chrome, if available.

See https://github.com/openid/AppAuth-Android/blob/0.11.1/library/java/net/openid/appauth/browser/BrowserMatcher.java

We're willing to help implement this if needed.

[MaikuB]

You're welcome to submit a PR and I'll then take a look