Rework services: generic scheduled and async tasks

[lafrech]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.09589% with 26 lines in your changes missing coverage. Please review.

Project coverage is 95.48%. Comparing base (fd4d495) to head (121af0f).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/bemserver_core/celery.py	60.52%	14 Missing and 1 partial ⚠️
.../bemserver_core/input_output/timeseries_data_io.py	75.00%	2 Missing and 5 partials ⚠️
src/bemserver_core/tasks/check_missing.py	96.92%	1 Missing and 1 partial ⚠️
src/bemserver_core/tasks/check_outliers.py	96.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
- Coverage   95.51%   95.48%   -0.03%     
==========================================
  Files          44       45       +1     
  Lines        2784     2679     -105     
  Branches      281      264      -17     
==========================================
- Hits         2659     2558     -101     
+ Misses        100       93       -7     
- Partials       25       28       +3     

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