feat(coredns): coredns_rewrite_block to perform internal message rewriting

[maxime1907]

What type of PR is this?

/kind feature

What this PR does / why we need it:
Adds a variable coredns_rewrite_block so that we can perform internal message rewriting.
It is really useful when we want for instance multiple internal domain names that resolve to cluster.local:

rewrite stop {
  name regex (.*)\.my\.domain {1}.svc.cluster.local
  answer name (.*)\.svc\.cluster\.local {1}.my.domain
}

Does this PR introduce a user-facing change?:

Add `coredns_rewrite_block` to perform internal message rewriting

[k8s-ci-robot]

Hi @maxime1907. Thanks for your PR.

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[yankay]

/ok-to-test

[oomichi]

/lgtm

[floryut]

@maxime1907 Thank you for the PR 🙇
/kind feature

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, maxime1907

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[oomichi]

/ok-to-test

[oomichi]

To kick CI jobs again.