adds kubernetes registry config for registry server

[ChrisJBurns]

We want the ability of creating a kubernetes registry type for the registry server to host running MCP servers inside of Kubernetes. This registry type indicates to registry server that it should specifically use Kubernetes annotations as means of finding deployed MCP servers.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.61%. Comparing base (3b1fc1e) to head (5533b19).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2830      +/-   ##
==========================================
- Coverage   56.61%   56.61%   -0.01%     
==========================================
  Files         320      320              
  Lines       30928    30932       +4     
==========================================
+ Hits        17509    17511       +2     
- Misses      11914    11916       +2     
  Partials     1505     1505              

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