chore: add support for gofumpt

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.85185% with 13 lines in your changes missing coverage. Please review.

Project coverage is 69.40%. Comparing base (5bf53e0) to head (31c118a).
Report is 272 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/testing.go	14.28%	6 Missing ⚠️
internal/core/example.go	0.00%	2 Missing ⚠️
...rnal/namespaces/mnq/v1beta1/custom_nats_helpers.go	0.00%	1 Missing and 1 partial ⚠️
internal/docgen/docgen.go	0.00%	1 Missing ⚠️
internal/namespaces/autocomplete/autocomplete.go	0.00%	1 Missing ⚠️
internal/namespaces/registry/v1/helpers_docker.go	66.66%	0 Missing and 1 partial ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (31c118a). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (31c118a)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4055      +/-   ##
==========================================
- Coverage   75.45%   69.40%   -6.06%     
==========================================
  Files         202      291      +89     
  Lines       44323    55620   +11297     
==========================================
+ Hits        33444    38602    +5158     
- Misses       9653    15442    +5789     
- Partials     1226     1576     +350     

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