Adding Virus_total_key argument

[PiranhaSa]

In this PR I've added the support for virustotal api key, so subfinder can use it . we can do that by adding the key to the provider-config.yaml conf file.

From inside the agent:

As you can see here, the virustotal API is called:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.78%. Comparing base (a35b197) to head (1ba0e76).
Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   90.09%   94.78%   +4.69%     
==========================================
  Files           4        4              
  Lines         111      211     +100     
==========================================
+ Hits          100      200     +100     
  Misses         11       11              

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[nmasdoufi-ol]

LGTM

Comments fixed.