Add the webhook for future CRD future conversion

[houshengbo]

Proposed Changes

• As Knative Operator starts to stabilize the APIs, we plan to release the v1 version. As the ground work, we need to make the conversion webhook ready.

Release Note

[codecov[bot]]

Codecov Report

Merging #1182 (881e0d5) into main (842d261) will not change coverage. The diff coverage is n/a.

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##             main    #1182   +/-   ##
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  Coverage   79.06%   79.06%           
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  Files          35       35           
  Lines        1519     1519           
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  Hits         1201     1201           
  Misses        232      232           
  Partials       86       86           

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[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: houshengbo, maximilien

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