feat: GraphQL fragments

[nasdf]

Relevant issue(s)

Resolves #3047

Description

This PR enables support for GraphQL fragments.

Tasks

• I made sure the code is well commented, particularly hard-to-understand areas.
• I made sure the repository-held documentation is changed accordingly.
• I made sure the pull request title adheres to the conventional commit style (the subset used in the project can be found in tools/configs/chglog/config.yml).
• I made sure to discuss its limitations such as threats to validity, vulnerability to mistake and misuse, robustness to invalidation of assumptions, resource requirements, ...

How has this been tested?

Added integration tests

Specify the platform(s) on which this was tested:

• MacOS

[codecov]

Codecov Report

Attention: Patch coverage is 85.45455% with 8 lines in your changes missing coverage. Please review.

Project coverage is 79.45%. Comparing base (8dae109) to head (b49a00a).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
internal/request/graphql/parser/request.go	74.19%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3066      +/-   ##
===========================================
+ Coverage    79.40%   79.45%   +0.05%     
===========================================
  Files          345      345              
  Lines        26534    26557      +23     
===========================================
+ Hits         21068    21100      +32     
+ Misses        3948     3942       -6     
+ Partials      1518     1515       -3     

Flag	Coverage Δ
all-tests	79.45% <85.45%> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/request/graphql/parser/mutation.go	85.92% <100.00%> (ø)
internal/request/graphql/parser/query.go	90.86% <100.00%> (ø)
internal/request/graphql/parser/subscription.go	79.31% <100.00%> (ø)
internal/request/graphql/parser/request.go	72.34% <74.19%> (-1.39%)	⬇️

... and 13 files with indirect coverage changes

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[jsimnz]

Reviewed but have a question. Should we also be supporting inline fragments? https://spec.graphql.org/October2021/#sec-Inline-Fragments

Fragments also support variables, if we want to support that too

[nasdf]

Reviewed but have a question. Should we also be supporting inline fragments? https://spec.graphql.org/October2021/#sec-Inline-Fragments

Fragments also support variables, if we want to support that too

Nice catch! We should be able to support inline fragments as well as variables. I'll add some tests to verify.

Update: Both work and are tested now.

[fredcarle]

suggestion: I'm not sure if you had changed them last time it was suggested but TestQuerySimple_WithFragments_Succeeds would read a little better and would be easier to go straight to the most descriptive part (WithFragment) of the test name.

[nasdf]

done

[fredcarle]

LGTM! I'm surprised how simple supporting fragments turned out to be.