feat(android): add configurable app path for embedded capacitor

[carlpoole]

This PR adds a configurable path string to load a specific initial path for a Capacitor app.

See #3405 and #4157

Example usage:

BridgeFragment embeddedFragment = BridgeFragment.newInstance("app1");
CapConfig config = new CapConfig.Builder(this)
            .setPath("/feature_1")
            .create();
        
embeddedFragment.setConfig(config);

[fkirc]

Thanks for implementing this much-needed feature!
I will migrate to V3 as soon as those runtime-paths are working for both Android and iOS.
Until now, I was using a path-redirect-workaround via a custom plugin, but this path-redirect-workaround was only working after an initial rendering of my embedded web-app.