Add: Retrying for NVDApi

[n-thumann]

What

This PR adds the retrying of requests to NVDApi and the inheriting classes.

Why

NVD is super unstable lately, so it's nearly impossible to retrieve a large response, because one of the HTTP requests will very likely fail. This caused vt-cve-library to be broken right now and cve-feeder to occasionally fail.

The current behavior on main is that the caller needs to handle those errors. However, the caller doesn't know which request (the offset of the paginated response) exactly failed, so send a new request starting from failed requests offset.
One option would be to somehow pass this offset to the caller, however I opted for the approach to handle retries directly inside Pontos, just like rate-limiting also is for a more out-of-the-box developer experience.

This implementation is backwards-compatible and assumes one attempt, if not specified otherwise.
If attempts is greater than 1 and there is a server-side (HTTP 5xx) error in the response, the request will be retried after a delay of 2 seconds, exponentially backing off.

In my tests for vt-cve-library I was finally able to request data from NVD again, which failed after a few minutes before this change.

References

Jira: https://jira.greenbone.net/browse/VTA-630

Checklist

• Tests

[github-actions]

Conventional Commits Report

Type	Number
Changed	2
Added	5

🚀 Conventional commits found.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.92%. Comparing base (10a5bf5) to head (fd81880).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1070      +/-   ##
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+ Coverage   89.91%   89.92%   +0.01%     
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  Files         108      108              
  Lines        7178     7187       +9     
  Branches      812      815       +3     
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+ Hits         6454     6463       +9     
  Misses        521      521              
  Partials      203      203              

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