What this PR does / why we need it:
Move canonicalhostedzone map of AWS provider to own package to allow reuse in repo gardener/provider-aws.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Release note:
Move canonicalhostedzone map of `aws-route53` provider to own package to allow reuse in [gardener/provider-aws](https://github.com/gardener/gardener-extension-provider-aws/).
What this PR does / why we need it: Move canonicalhostedzone map of AWS provider to own package to allow reuse in repo gardener/provider-aws.
Which issue(s) this PR fixes: Fixes #
Special notes for your reviewer:
Release note: