[WIP] Add multi-cluster deployment support via Cluster Inventory API

[kahirokunn]

Fixes #2264

Proposed Changes

Release Note

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow]

@kahirokunn: 0 warnings.

Details

In response to this:

Fixes #

Proposed Changes

Release Note

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[codecov]

Codecov Report

❌ Patch coverage is 45.52239% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.78%. Comparing base (e397696) to head (7d7ee32).

Files with missing lines	Patch %	Lines
pkg/reconciler/common/multicluster.go	46.01%	56 Missing and 5 partials ⚠️
cmd/operator/main.go	0.00%	4 Missing ⚠️
pkg/reconciler/knativeeventing/controller.go	0.00%	3 Missing ⚠️
pkg/reconciler/knativeserving/controller.go	0.00%	3 Missing ⚠️
pkg/apis/operator/base/common.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2267      +/-   ##
==========================================
- Coverage   63.97%   62.78%   -1.20%     
==========================================
  Files          51       52       +1     
  Lines        1960     2088     +128     
==========================================
+ Hits         1254     1311      +57     
- Misses        605      671      +66     
- Partials      101      106       +5     

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[knative-prow]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[knative-prow]

There are empty aliases in OWNER_ALIASES, cleanup is advised.

[knative-prow]

@kahirokunn: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
build-tests_operator_main	7d7ee32	link	true	/test build-tests

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