Add support for typeDefs and resolvers ecosystem compatibility

[MichalLytek]

Closes #222 and allows for #135.
For #197 it needs example and a confirmation.

[codecov]

Codecov Report

Merging #233 into master will decrease coverage by <.01%.
The diff coverage is 96%.

@@            Coverage Diff             @@
##           master     #233      +/-   ##
==========================================
- Coverage   95.49%   95.49%   -0.01%     
==========================================
  Files          62       65       +3     
  Lines         999     1043      +44     
  Branches      177      186       +9     
==========================================
+ Hits          954      996      +42     
- Misses         44       46       +2     
  Partials        1        1

Impacted Files	Coverage Δ
src/utils/index.ts	100% <100%> (ø)
src/index.ts	100% <100%> (ø)	⬆️
src/utils/buildTypeDefsAndResolvers.ts	100% <100%> (ø)
src/utils/createResolversMap.ts	94.59% <94.59%> (ø)

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