refactor into workspaces

[drmorr0]

• 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]

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 ⚠️
sk-core/src/time.rs	57.14%	3 Missing ⚠️
sk-ctrl/src/errors.rs	0.00%	3 Missing ⚠️
sk-ctrl/src/cert_manager.rs	0.00%	1 Missing ⚠️
sk-ctrl/src/controller.rs	75.00%	1 Missing ⚠️
sk-store/src/watchers/dyn_obj_watcher.rs	0.00%	1 Missing ⚠️
sk-store/src/watchers/pod_watcher.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            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     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.