fix: group fields and related issues

[birkir]

This PR

• Fixes group fields that made them incompatible with default options.
• Show/hide mutations on proper setting
• Don't show allXXX on singles

[codecov]

Codecov Report

Merging #103 into master will decrease coverage by 0.18%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #103      +/-   ##
==========================================
- Coverage   78.73%   78.55%   -0.19%     
==========================================
  Files         103      103              
  Lines        2107     2112       +5     
  Branches      148      150       +2     
==========================================
  Hits         1659     1659              
- Misses        431      436       +5     
  Partials       17       17

Impacted Files	Coverage Δ
packages/prime-field-group/src/PrimeFieldGroup.ts	60% <0%> (-10%)	⬇️
...dules/external/resolvers/createDocumentResolver.ts	100% <100%> (ø)	⬆️
packages/prime-core/src/modules/external/index.ts	87.15% <100%> (ø)	⬆️

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