Frappe Oauth or Token bases auth provider for Android

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OAuth 2 provider for Frappe Apps

Pull Request: https://github.com/frappe/frappe/pull/2167 How to Setup: https://github.com/revant/frappe/blob/develop/frappe/docs/user/en/guides/integration/how_to_setup_oauth.md Usage: https://github.com/revant/frappe/blob/develop/frappe/docs/user/en/guides/integration/using_oauth.md