Add POLLINTF API command

[johannaengland]

Scope and purpose

Fixes #218.

This pull request

• changes the API

Contributor Checklist

Every pull request should have this checklist filled out, no matter how small it is.
More information about contributing to Zino can be found in the
README.

• Added a changelog fragment for towncrier
• Added/amended tests for new/changed code
• Added/changed documentation
  • well, tests are documentation...
• Linted/formatted the code with black, ruff and isort, easiest by using pre-commit
• The first line of the commit message continues the sentence "If applied, this commit will ...", starts with a capital letter, does not end with punctuation and is 50 characters or less long. See https://cbea.ms/git-commit/
• If applicable: Created new issues if this PR does not fix the issue completely/there is further work to be done

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.80%. Comparing base (66c22f0) to head (4337546).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #300   +/-   ##
=======================================
  Coverage   97.79%   97.80%           
=======================================
  Files          55       55           
  Lines        7380     7395   +15     
=======================================
+ Hits         7217     7232   +15     
  Misses        163      163           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[lunkwill42]

I've taken the liberty to clean this up a little in your absence.

My changes made me realize that we should really consider adding a polldevs dict to the API server instance as well. The original reached into the global state, which isn't necessary, since the API server instance has a reference to the state. However, it still reaches out to the global polldevs dictionary, which I would prefer it didn't.