[GSOC] OAuth feature addition

[neogismm]

Description

This PR is to add functionality for OAuth 2.0 authentication with Google as IDP. Continuation of #6524

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?

[sonarqubecloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
3 Vulnerabilities
0 Security Hotspots
23 Code Smells

0.0% Coverage
7.2% Duplication

[codecov[bot]]

Codecov Report

Merging #6713 (2f0087e) into main (687a21c) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main    #6713      +/-   ##
============================================
- Coverage      5.90%    5.89%   -0.01%     
+ Complexity     3946     3945       -1     
============================================
  Files          2454     2464      +10     
  Lines        242749   242867     +118     
  Branches      37991    37999       +8     
============================================
- Hits          14325    14323       -2     
- Misses       226839   226960     +121     
+ Partials       1585     1584       -1     

Impacted Files	Coverage Δ
...rg/apache/cloudstack/oauth2/OAuth2AuthManager.java	0.00% <0.00%> (ø)
...pache/cloudstack/oauth2/OAuth2AuthManagerImpl.java	0.00% <0.00%> (ø)
...che/cloudstack/oauth2/OAuth2UserAuthenticator.java	0.00% <0.00%> (ø)
...java/org/apache/cloudstack/oauth2/OAuth2Utils.java	0.00% <0.00%> (ø)
...stack/oauth2/api/command/AuthorizeOauthSSOCmd.java	0.00% <0.00%> (ø)
...ack/oauth2/api/response/OauthProviderResponse.java	0.00% <0.00%> (ø)
...dstack/oauth2/googleAuth/LoginCallbackServlet.java	0.00% <0.00%> (ø)
...che/cloudstack/oauth2/googleAuth/LoginServlet.java	0.00% <0.00%> (ø)
...he/cloudstack/oauth2/googleAuth/LogoutServlet.java	0.00% <0.00%> (ø)
...e/cloudstack/oauth2/googleAuth/ProfileServlet.java	0.00% <0.00%> (ø)
... and 1 more

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[shwstppr]

@neogismm cc @harikrishna-patnala is this still relevant with the new PR #7996 ?

[github-actions[bot]]

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

[DaanHoogland]

@neogismm @harikrishna-patnala , can we close this?

[DaanHoogland]

@neogismm @harikrishna-patnala I am closing this as #7996 is merged. Please reopen or create a new PR if anything else needs addressing.