Add AuthenticatableType duck type

[creydr]

Similar to what we have for Addressables, this PR adds the duck type AuthenticatableType for objects, which have a AuthStatus.

In addition it adds a resolver similar to the addressable_resolver to work with this type.

[codecov]

Codecov Report

Attention: Patch coverage is 56.45161% with 27 lines in your changes missing coverage. Please review.

Project coverage is 78.62%. Comparing base (15e6cdf) to head (8ad286f).

Files	Patch %	Lines
apis/duck/v1/auth_types.go	0.00%	19 Missing ⚠️
resolver/authenticatable_resolver.go	81.39%	4 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3056      +/-   ##
==========================================
- Coverage   78.75%   78.62%   -0.14%     
==========================================
  Files         189      191       +2     
  Lines        8872     8934      +62     
==========================================
+ Hits         6987     7024      +37     
- Misses       1620     1642      +22     
- Partials      265      268       +3     

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[creydr]

/test unit-tests

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [creydr,pierDipi]
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