feat: add RequestReply types and CRD

[Cali0707]

Fixes #8177

Proposed Changes

• Add RequestReply v1alpha1 CRD
• Add RequestReply types (Spec, Status, etc.)
• Add RequestReply validation/defaulting/lifecycle code

Release Note

Added the RequestReply CRD and types (no controller/data plane implementation yet)

[Cali0707]

/cc @pierDipi @creydr @matzew

[codecov]

Codecov Report

Attention: Patch coverage is 65.09434% with 37 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@ebe99e6). Learn more about missing BASE report.
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
.../apis/eventing/v1alpha1/requestreply_validation.go	35.71%	19 Missing and 8 partials ⚠️
...g/apis/eventing/v1alpha1/requestreply_lifecycle.go	79.48%	8 Missing ⚠️
pkg/apis/eventing/v1alpha1/requestreply_types.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8337   +/-   ##
=======================================
  Coverage        ?   64.53%           
=======================================
  Files           ?      380           
  Lines           ?    22772           
  Branches        ?        0           
=======================================
  Hits            ?    14697           
  Misses          ?     7300           
  Partials        ?      775           

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[pierDipi]

I think we could make this globally configurable in the features flag config map

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, pierDipi

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