[IDEA] make DGA less strict on input validation

[frikilax]

What is your feature about ?
about DGA validating input with IsDomainValid().

If your request is about an existing filter/functionality
DGA

Describe what you'd like
FAUP is used to extract tld and root domain, it can handle input with more complex addresses (including complete URLs).
Currently, IsDomainValid() check for input looking like "sub.domain.tld", this function could be adapted to allow more complex addresses to be analysed.

Additional context
This feature might not be desirable, as we may want to analyze onlt strict dns requests made to such generated domains, but this would restrict FDGA to wider ranges of available input.