[Refactor] Improved Logging for IdentityServer

[komer3]

• Add comments for IdentityServer struct and methods
• Implement structured logging using logger.GetLogger
• Remove dependency on k8s.io/klog/v2
• Add log entries for request processing and completion

General:

• [ ] Have you removed all sensitive information, including but not limited to access keys and passwords?
• [ ] Have you checked to ensure there aren't other open or closed Pull Requests for the same bug/feature/question?

Pull Request Guidelines:

1. [ ] Does your submission pass tests?
2. [ ] Have you added tests?
3. [ ] Are you addressing a single feature in this PR?
4. [ ] Are your commits atomic, addressing one change per commit?
5. [ ] Are you following the conventions of the language?
6. [ ] Have you saved your large formatting changes for a different PR, so we can focus on your work?
7. [ ] Have you explained your rationale for why this feature is needed?
8. [ ] Have you linked your PR to an open issue

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 38.66%. Comparing base (fd0b7a4) to head (50c8767). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/driver/identityserver.go	0.00%	9 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #220 +/- ## ========================================== - Coverage 38.78% 38.66% -0.12% ========================================== Files 24 24 Lines 1952 1958 +6 ========================================== Hits 757 757 - Misses 1159 1165 +6 Partials 36 36 ```

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