fix: Add missing directive definitions

[fredcarle]

Relevant issue(s)

Resolves #2312

Description

This PR adds the missing directive definitions (@crdt, @primary, @relation) to GraphQL

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?

tested in GraphQL client

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

• MacOS

[nasdf]

Looks good! Just one non-blocking question

[nasdf]

question: Would it be possible to make this an enum type that consists of all of our supported CRDT types?

[fredcarle]

Made the change to enum. Let me know what you think.

[nasdf]

Nice work! This will be super helpful for people learning about CRDT types.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.89%. Comparing base (eb872f5) to head (e9511c4).
Report is 1 commits behind head on develop.

❗ Current head e9511c4 differs from pull request most recent head eeada2a. Consider uploading reports for the commit eeada2a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2369      +/-   ##
===========================================
- Coverage    75.03%   74.89%   -0.14%     
===========================================
  Files          266      266              
  Lines        25855    25857       +2     
===========================================
- Hits         19400    19365      -35     
- Misses        5150     5177      +27     
- Partials      1305     1315      +10     

Flag	Coverage Δ
all-tests	74.89% <100.00%> (-0.14%)	⬇️

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

Files	Coverage Δ
request/graphql/schema/collection.go	90.77% <100.00%> (+0.45%)	⬆️
request/graphql/schema/manager.go	97.54% <100.00%> (+0.06%)	⬆️
request/graphql/schema/types/types.go	100.00% <ø> (ø)

... and 9 files with indirect coverage changes

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[shahzadlone]

LGTM, just a non-blocking thought.

thought: I know Index* directives were there before, but do we want to somehow separate the Schema Directives from the Operation Directives (on Request/Query).

For example @explain is not a Schema Directive.

[fredcarle]

thought: I know Index* directives were there before, but do we want to somehow separate the Schema Directives from the Operation Directives (on Request/Query).

For example @explain is not a Schema Directive.

I think it's worth looking into it. But in a different PR :)