feat(server): support reflection and UI

[smintz]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 20.98765% with 192 lines in your changes are missing coverage. Please review.

Project coverage is 64.00%. Comparing base (205f98b) to head (7f9e077).

Files	Patch %	Lines
server/server.go	6.52%	172 Missing ⚠️
server/legacy.go	0.00%	9 Missing ⚠️
utils/utils.go	69.56%	5 Missing and 2 partials ⚠️
compiler/lib/config.go	60.00%	1 Missing and 1 partial ⚠️
compiler/lib/starlark_loader.go	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           buf_validation      #33      +/-   ##
==================================================
- Coverage           70.89%   64.00%   -6.90%     
==================================================
  Files                  15       16       +1     
  Lines                1704     1875     +171     
==================================================
- Hits                 1208     1200       -8     
- Misses                354      534     +180     
+ Partials              142      141       -1     

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