openapi: support client-generated id

[verdie-g]

Closes #1054

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• Documentation updated

[verdie-g]

@bkoelman could you help with the those comments 👆

[bkoelman]

Tests are needed to cover:

• Sending without ID
• Sending with ID

for the three modes Forbidden, Allowed and Required.

The easiest setup would be to have three resource types with different [Resource(ClientIdGeneration = ...)] for the three modes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.75%. Comparing base (54c401c) to head (8af7556).

Additional details and impacted files

@@           Coverage Diff            @@
##           openapi    #1475   +/-   ##
========================================
  Coverage    90.75%   90.75%           
========================================
  Files          390      390           
  Lines        12883    12883           
  Branches      2044     2044           
========================================
  Hits         11692    11692           
  Misses         776      776           
  Partials       415      415           

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[bkoelman]

See comments.

[bkoelman]

See comments.

[bkoelman]

Few minor comments.

[bkoelman]

LGTM

If you don't mind, I'd like to merge Kiota support first, so Kiota tests can be added to this PR before merging it.

[verdie-g]

Thanks! I couldn't find the time to do the Kiota part.