[anyrun-feed] Fixed paid auth

[rnaumov-any]

Any.Run provides a demo feed with API-key authorization and a Paid feed with Basic authorization. Added automatic selection of authorization method

Proposed changes

• Enumeration of authorization methods

Related issues

• loading a paid feed stopped working because it was replaced in Fix anyrun_feed.py #2562 with Api-key

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality using different use cases
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[rnaumov-any]

hello, why our fix is not merging? this fix is really important, our client can't use our feed. Old version after this change is not working

[rnaumov-any]

We've updated the documentation. In accordance with the documentation, Basic authorization must be used https://intelligence.any.run/Threat_Intelligence_Feeds_Documentation_v3.pdf

[helene-nguyen]

@rnaumov-any Thanks for the fix, merge is blocked because format and commits are not signed. Could you please ensure the format, you can rebase master as black and isort was updated to a new version and could you please sign your commits with GPG to have a verified signature ?