Support impersonating other users for super admin

[JohnNiang]

What type of PR is this?

/kind feature
/area core
/milestone 2.20.x

What this PR does / why we need it:

This PR adds support for impersonating other users for super admin.

1. Login as super admin
2. Request POST /login/impersonate?username=xxx and the current user should be xxx
3. Request POST /logout/impersonate and the current user should be super admin

Does this PR introduce a user-facing change?

None

[codecov]

Codecov Report

Attention: Patch coverage is 90.32258% with 3 lines in your changes missing coverage. Please review.

Project coverage is 57.51%. Comparing base (60c2009) to head (d1a6e2a).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
...rity/HaloRedirectAuthenticationSuccessHandler.java	81.25%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7351      +/-   ##
============================================
+ Coverage     57.18%   57.51%   +0.33%     
- Complexity     4066     4113      +47     
============================================
  Files           721      725       +4     
  Lines         24546    24696     +150     
  Branches       1612     1635      +23     
============================================
+ Hits          14036    14204     +168     
+ Misses         9882     9841      -41     
- Partials        628      651      +23     

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[ruibaby]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

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Details

Needs approval from an approver in each of these files:

• OWNERS [ruibaby]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ruibaby

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [ruibaby]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud