Update Integration API and use custom tags on structs for better readability

[matzew]

Proposed Changes

• starting with custom tags for complicated camel properties, to make the source spec easier to read

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 64.58%. Comparing base (9d67389) to head (2167a43).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...ler/integrationsource/resources/containersource.go	66.66%	2 Missing and 1 partial ⚠️
...kg/apis/sources/v1alpha1/integration_validation.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8321   +/-   ##
=======================================
  Coverage   64.58%   64.58%           
=======================================
  Files         373      373           
  Lines       22619    22619           
=======================================
  Hits        14609    14609           
  Misses       7244     7244           
  Partials      766      766           

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[matzew]

@pierDipi if you have time, would be nice to take a look here. Is the first PR of a series of smaller changes and improvements.

On purpose I only used the "custom" camel tags only where we changed the field/property, yet

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, pierDipi

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