[feat] Enable support for encrypted volumes for CSI driver

[prajwalvathreya]

General:

This PR focuses on enabling support for encrypted volumes for the CSI driver.

It addresses the following tasks:

• creating an encrypted volume (region specific)

• attaching the volume to a node (region specific)

• handling errors in case of mismatch in attaching a volume to a node

• [x] Have you removed all sensitive information, including but not limited to access keys and passwords?

• [x] 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. [x] Are you addressing a single feature in this PR?
4. [x] Are your commits atomic, addressing one change per commit?
5. [x] 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 84.28571% with 11 lines in your changes missing coverage. Please review.

Project coverage is 74.79%. Comparing base (c523c92) to head (02a5bd1). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/driver/controllerserver_helper.go	83.58%	8 Missing and 3 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #299 +/- ## ========================================== + Coverage 73.68% 74.79% +1.10% ========================================== Files 22 22 Lines 2356 2396 +40 ========================================== + Hits 1736 1792 +56 + Misses 522 499 -23 - Partials 98 105 +7 ```

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