Google Authentication using the new API

[CosminBd]

This PR is related to #940 Using the new Google API for authentication, which moves away from OAuth and to using JWT's for identifing users.

There are still a couple of things to be fixed, mainly:

• the manager package requires providers to implement ProviderInterfaces for OAuth1 or OAuth2. This needs to be addressed in the root package as the class has a few redundant methods. Same thing applies for the Google User class.
• I've tried to add testing but when moving files to separate "/src" and "/tests" directories I'm getting autoload errors from composer
• client_secret is not needed, but required by the manager package

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[lucasmichot]

Hello @CosminBd and thanks for your contribution PR Can you resolve the conflict in src/Google/composer.json ?

[atymic]

@lucasmichot

@CosminBd could you resolve conflicts?

[CosminBd]

@atymic it's good to go now

[atymic]

@CosminBd

[alinmiron]

@CosminBd Hey man, is it possible to handle this ? Thanks!

[atymic]

@CosminBd