[resotocore][feat] Maintain subscribers in memory

[aquamatthias]

Description

To-Dos

• Add test coverage for new or updated functionality
• Lint and test with tox

Code of Conduct

By submitting this pull request, I agree to follow the code of conduct.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5099152) 89.89% compared to head (73b02bc) 89.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1819      +/-   ##
==========================================
- Coverage   89.89%   89.84%   -0.05%     
==========================================
  Files          92       91       -1     
  Lines       15710    15686      -24     
==========================================
- Hits        14122    14093      -29     
- Misses       1588     1593       +5     

Flag	Coverage Δ
resotocore	89.84% <100.00%> (-0.05%)	⬇️

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Files	Coverage Δ
resotocore/resotocore/__main__.py	80.21% <100.00%> (ø)
resotocore/resotocore/db/db_access.py	82.41% <ø> (-0.27%)	⬇️
resotocore/resotocore/task/subscribers.py	75.55% <100.00%> (-1.48%)	⬇️

... and 1 file with indirect coverage changes

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