Add domains/regex tooltip on the sidebar numbers

[DL6ER]

What does this implement/fix?

See title. As requested on Discourse.

Important

Needs FTL on the same branch tweak/api_regex_count pi-hole/FTL#2071

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Related issue or feature (if applicable): https://discourse.pi-hole.net/t/show-number-of-domains-regex-on-the-left/72530

Pull request in docs with documentation (if applicable): N/A

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[yubiuser]

The tooltip should contain "allowed" and "denied" in text form. This could be useful for screen readers.

[DL6ER]