Allow dot character in service names

[santo-codes]

Is your feature request related to a problem? Please describe.
Currently queries of the form <name>.service.<domain> are supported. <name> values cannot have the dot character. Services in our project tend to have the dot character. Can it be supported please?

Describe the solution you'd like
Solution is simple. SERVICE_NAME_REGEX in DnsQueryHandler needs minor change. Add \\. in the first capturing group. I.e.

private static final String SERVICE_NAME_REGEX = "^_?([\\w\\-\\.]+)\\.(?:_\\w+\\.)?(?:service|connect)\\.";

Describe alternatives you've considered
None.

Additional context
None.

[santo-codes]

I can raise a PR if this feature request looks ok.