refactor into workspaces

[drmorr0]

• [x] I certify that this PR does not contain any code that has been generated with GitHub Copilot or any other AI-based code generation tool, in accordance with this project's policies.

Description

Starts using workspaces for the "compilation speed"

Testing done

• make test still passes

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 79.01235% with 17 lines in your changes missing coverage. Please review.

Project coverage is 74.43%. Comparing base (c8ecc41) to head (be74bde).

Files	Patch %	Lines
sk-core/src/k8s/sim.rs	0.00%	7 Missing :warning:
sk-core/src/time.rs	57.14%	3 Missing :warning:
sk-ctrl/src/errors.rs	0.00%	3 Missing :warning:
sk-ctrl/src/cert_manager.rs	0.00%	1 Missing :warning:
sk-ctrl/src/controller.rs	75.00%	1 Missing :warning:
sk-store/src/watchers/dyn_obj_watcher.rs	0.00%	1 Missing :warning:
sk-store/src/watchers/pod_watcher.rs	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #124 +/- ## ========================================== + Coverage 72.15% 74.43% +2.27% ========================================== Files 40 44 +4 Lines 2313 2546 +233 ========================================== + Hits 1669 1895 +226 - Misses 644 651 +7 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.