Extend the control plane options to the public API

[yankcrime]

The end customer is best placed to ultimately decide on how big they need their control plane nodes to be, based on their workload and patterns.

Default behaviour remains the same, otherwise allow overriding the specification in the API.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.84%. Comparing base (a301fb2) to head (2301b3a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/server/handler/cluster/conversion.go	0.00%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #382      +/-   ##
========================================
- Coverage   4.50%   3.84%   -0.66%     
========================================
  Files         59      59              
  Lines       5754    5768      +14     
========================================
- Hits         259     222      -37     
- Misses      5457    5470      +13     
- Partials      38      76      +38     

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[spjmurray]

Seems legit, and backwards compatible.

[spjmurray]

Merge error
Base branch requires signed commits. Rebase merges cannot be automatically signed by GitHub

[yankcrime]

@spjmurray Try again please 🙏