Validate that all referenced types are included in dependency files

[andrewhickman]

Fixes #57

[codecov]

Codecov Report

Patch coverage: 78.74% and project coverage change: +0.14% 🎉

Comparison is base (1b97845) 76.19% compared to head (8e2292f) 76.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
+ Coverage   76.19%   76.34%   +0.14%     
==========================================
  Files          31       31              
  Lines        5399     5457      +58     
==========================================
+ Hits         4114     4166      +52     
- Misses       1285     1291       +6     

Files Changed	Coverage Δ
prost-reflect/src/descriptor/mod.rs	65.00% <ø> (ø)
prost-reflect/tests/main.rs	100.00% <ø> (ø)
prost-reflect/src/descriptor/build/resolve.rs	68.11% <76.31%> (+0.70%)	⬆️
prost-reflect/src/descriptor/build/options.rs	64.74% <76.92%> (+1.87%)	⬆️
prost-reflect/src/descriptor/error.rs	54.46% <81.25%> (+1.15%)	⬆️
prost-reflect/src/descriptor/build/mod.rs	96.87% <85.00%> (-3.13%)	⬇️
prost-reflect/src/descriptor/build/names.rs	66.82% <100.00%> (+0.16%)	⬆️

... and 2 files with indirect coverage changes

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