refactor: Extract definition stuff from collection.go

[AndrewSisley]

Relevant issue(s)

Resolves #2407

Description

Extracts collection create and patch, schema patch, and validation from collection.go.

It was getting really messy in collection.go and this should hopefully be a little better. No code has changed, only moved.

[codecov]

Codecov Report

Attention: Patch coverage is 82.99817% with 93 lines in your changes missing coverage. Please review.

Project coverage is 77.85%. Comparing base (8d0c756) to head (55de3b5).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2706      +/-   ##
===========================================
- Coverage    77.95%   77.85%   -0.10%     
===========================================
  Files          308      310       +2     
  Lines        23125    23125              
===========================================
- Hits         18025    18002      -23     
- Misses        3715     3731      +16     
- Partials      1385     1392       +7     

Flag	Coverage Δ
all-tests	77.85% <83.00%> (-0.10%)	⬇️

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

Files	Coverage Δ
internal/db/collection.go	71.84% <ø> (-5.89%)	⬇️
internal/db/definition_validation.go	93.60% <93.60%> (ø)
internal/db/schema.go	80.75% <73.87%> (-4.96%)	⬇️
internal/db/collection_define.go	74.19% <74.19%> (ø)

... and 7 files with indirect coverage changes

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[shahzadlone]

Cheers thanks for the re-org! LGTM