[GSOC] Oauth2 google idp

[neogismm]

Description

This PR is to add functionality for OAuth 2.0 authentication with Google as IDP.

Progress:

• [x] Obtain client id/secret from Google API console
• [x] Create a Util class for the core methods
• [x] Create a Servlet class that handles redirect URLs for a successful or failed auth flow
• [x] Method to check if the user is already logged in
• [ ] Check if the user is a new or existing user (implement checking methods with cloudstack database)
• [x] Logout method
• [ ] Make changes in UI

NB: Progress milestones to be added/edited as I grow my understanding of the codebase.

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Enhancement (improves an existing feature and functionality)
• [ ] Cleanup (Code refactoring and cleanup, that may add test cases)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• [x] Major
• [ ] Minor

Bug Severity

• [ ] BLOCKER
• [ ] Critical
• [ ] Major
• [ ] Minor
• [ ] Trivial

Screenshots (if appropriate):

How Has This Been Tested?

[acs-robot]

Found UI changes, kicking a new UI QA build @blueorangutan ui

[blueorangutan]

@acs-robot a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: :heavy_check_mark: Live QA URL: http://qa.cloudstack.cloud:8080/client/pr/6524 (SL-JID-1887)

[github-actions[bot]]

This pull request has merge conflicts. Dear author, please fix the conflicts and sync your branch with the base branch.

[acs-robot]

Found UI changes, kicking a new UI QA build @blueorangutan ui

[blueorangutan]

@acs-robot a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: :heavy_multiplication_x: (SL-JID-2292)