#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
This PR bumps all version to 2.20.0 to prepare for next development.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
This is a regular updates after a new release.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
Regenerate API docs and client to prevent unrelated changes from other PRs.
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind feature
/area core
/milestone 2.17.x
#### What this PR does / why we need it:
This PR adds patch method for all extensions API.
Patch example:
```bash
http -a admin:admin PATCH http://localhost:8090/apis/plugin.halo.run/v1alpha1/plugins/app-store-integration \
Content-Type:application/json-patch+json \
--raw='[{"op": "replace", "path": "/spec/enabled", "value": false}]'
```
#### Which issue(s) this PR fixes:
Fixes#2311
#### Does this PR introduce a user-facing change?
```release-note
None
```
John Niang