Add Changelog for v8.3.0

[xing-yang]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design

/kind documentation

/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Adds changelog for v8.3.0.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
This is submitted on top of #1310 which should be merged first.

Does this PR introduce a user-facing change?:

NONE 

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xing-yang

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[Madhu-1]

/lgtm