Update status of New Events API KEP to implemented

[chelseychen]

The new Events API has been graduated to GA in 1.19, so mark this KEP as implemented.
Also add implementation PRs to the Implementation History section for the record.

[k8s-ci-robot]

Hi @chelseychen. Thanks for your PR.

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[chelseychen]

/assign @wojtek-t
Thanks!

[wojtek-t]

LGTM modulo one small comment.

/assign @dashpole @ehashman

[dashpole]

/ok-to-test

[dashpole]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chelseychen, dashpole

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