CCT - AuthTab Sample Demo

[erikrodriguez-se]

This PR contains a working demo for an implementation of AuthTab for Chrome Custom Tabs for Android. The included project, custom-tabs-authview, uses the existing custom-tabs-oauth demo as a guide for authentication using a website, in this case Github.

Some notes:

• The demo uses the custom redirect scheme. If it is desired to use https scheme instead, I can update the project accordingly.
• Some updates beyond the demo were required for the android-browser-helper project to compile in newer versions of Android Studio. Namely, these changes included namespace additions to gradle files as well as updating the gradle version used in the project.

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[orbital17]

Hi Erik, thanks for the PR!
In general, SDK version, Java version and Gradle version need to be updated, but they need to be kept consistent across the project, and it's better to handle these updates in a separate PR.
Would you like to create a PR for the updates? We are not sure when we’ll be able to handle this ourselves. Alternatively, you can try to implement the demo without updating the versions.

[ukaratkevich]

+1 to make a separate PR with build changes.
I also doubt that we want to use androidx snapshots for demo, I'd wait at least for 1.9.0 alpha.

[erikrodriguez-se]

Hi all, I can split this in to two PRs. I'll make this one specific to AuthTab and will create another for project updates.