[NEW] Transfer schema Transform

[santino]

Description

This PR introduces a new transform to copy and/or move parts of a GraphQL schema. It allows to copy/move fields from one Type to another. Similarly, it also allows to copy/move args from one field to another.

This PR takes inspiration from #2975 and would eventually supersede #3041

cc @ntziolis, @Lappihuan

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

New tests have been introduced

Checklist:

• [x] I have followed the CONTRIBUTING doc and the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests and linter rules pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

Further comments

I will probably add a few more tests (e.g copy/move fields for non Root Types). I also need to write the documentation, I will wait for feedback on this PR before doing this so that eventually I do this once API is fully approved.

In the meantime, all tests available are in working order and can serve as an explanation of what the transform does and how it can be used.

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Latest commit: f004305a199f2c6922d6642c13fec9376025747d

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