feat: new hook for modifying object types

[smyrick]

Fixes #231

Adds a new hook that can be used to modify all the GraphQLTypes that get generated from reflection. This allows for runtime documentation or any other changes that may want to be made to types after they are fully generated

[codecov]

Codecov Report

Merging #232 into master will decrease coverage by 0.14%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #232      +/-   ##
============================================
- Coverage     98.43%   98.29%   -0.15%     
  Complexity      178      178              
============================================
  Files            57       57              
  Lines           575      585      +10     
  Branches         99      103       +4     
============================================
+ Hits            566      575       +9     
  Misses            4        4              
- Partials          5        6       +1

Impacted Files	Coverage Δ	Complexity Δ
...otlin/com/expedia/graphql/generator/TypeBuilder.kt	100% <100%> (ø)	19 <0> (ø)	⬇️
.../com/expedia/graphql/hooks/SchemaGeneratorHooks.kt	100% <100%> (ø)	0 <0> (ø)	⬇️
...m/expedia/graphql/execution/FunctionDataFetcher.kt	86.95% <0%> (-3.96%)	11% <0%> (ø)
...expedia/graphql/generator/types/FunctionBuilder.kt	100% <0%> (ø)	13% <0%> (ø)	⬇️
.../com/expedia/graphql/generator/state/TypesCache.kt	100% <0%> (ø)	21% <0%> (ø)	⬇️
...raphql/generator/extensions/kPropertyExtensions.kt	100% <0%> (ø)	0% <0%> (ø)	⬇️
...otlin/com/expedia/graphql/DirectiveWiringHelper.kt	100% <0%> (ø)	11% <0%> (ø)	⬇️
.../graphql/generator/extensions/graphQLExtensions.kt	91.3% <0%> (+0.39%)	0% <0%> (ø)	⬇️

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