Add ProxyNova as an email and password discovery source

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Is your feature request related to a problem? Please describe.
InfoHound gathers a lot of emails, but it would be nice to check whether they have been compromised in the past.

Describe the solution you'd like
Add ProxyNova to both discovery new emails from a domain and gather possible passwords. It is a free service and it has an API.

Describe alternatives you've considered
None

Additional context
Link to documentation here