Add Custom wildcard DNS records.

[DjoSmer]

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What does this PR aim to accomplish?:

Wildcard DNS, for those who don’t know – is a trick to allow any kind of host name – to have a specific same IP as it’s DNS name. For example, if my domain is test.com and my IP is 1.2.3.4, the record full.test.com will also have the same IP: 1.2.3.4.

WildcardDNS.mov

How does this PR accomplish the above?:

It depends on pi-hole/pi-hole#5591.
I have added an interface where you can control custom wildcard DNS records.
There you can add, activate, deactivate, delete records.
You can also export and import the settings.

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See comments on pi-hole/pi-hole#5591