chore: rename compiler/proto to starproto

[smintz]

This change is 

[codecov]

Codecov Report

Merging #184 (96e69be) into master (46056e0) will not change coverage.
The diff coverage is 85.71%.

@@           Coverage Diff           @@
##           master     #184   +/-   ##
=======================================
  Coverage   64.07%   64.07%           
=======================================
  Files          15       15           
  Lines        1275     1275           
=======================================
  Hits          817      817           
  Misses        379      379           
  Partials       79       79           

Impacted Files	Coverage Δ
compiler/lib/compiler.go	69.72% <66.66%> (ø)
compiler/lib/config.go	66.66% <100.00%> (ø)
compiler/lib/starlark_functions.go	61.29% <100.00%> (ø)
compiler/lib/starlark_loader.go	66.17% <100.00%> (ø)

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