Draft: Add rate limits for TLS connections to a single domain

What does this MR do?

https://gitlab.com/gitlab-org/gitlab-pages/-/issues/632

TODO

• I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
• I added unit tests or they are not required
• I added acceptance tests or they are not required
• I added documentation (or it's not required)
• I followed code review guidelines
• I followed Go Style guidelines