SinkBinding stored version v1 and migration tool

[pierDipi]

Fixes #4264

Proposed Changes

• SinkBinding stored version v1
• Add migration tool

Release Note

Action Required: You need to run the storage migration tool after the upgrade to migrate from v1beta1 to v1 `sinkbindings.sources.knative.dev` resources.

[knative-prow-robot]

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[pierDipi]

This is based on #4655.

[codecov]

Codecov Report

Merging #4658 (005faf0) into master (653febd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4658   +/-   ##
=======================================
  Coverage   81.07%   81.07%           
=======================================
  Files         291      291           
  Lines        8216     8216           
=======================================
  Hits         6661     6661           
  Misses       1154     1154           
  Partials      401      401           

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[eclipselu]

/lgtm

[pierDipi]

Flaky #4637

        --- FAIL: TestBrokerAsMiddleware/Assert/[Stable/MUST]broker_as_middleware_deliver_an_event (240.00s)
panic: Fail in goroutine after TestBrokerAsMiddleware/Setup has completed [recovered]
	panic: Fail in goroutine after TestBrokerAsMiddleware/Setup has completed

/retest