Move websockets-stuff to spa-dir

[hmpf]

Replaces #785

This renames the "argus.ws" module to "argus.spa.ws" and turns "argus.spa" into an app. This will make it even easier to drop support for spa and redis when the day comes.

argus.ws.asgi has been renamed to argus.spa.ws.asgi.

Redis issues: #253, #1063

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test results

   10 files  1 060 suites   37m 31s ⏱️
  536 tests   535 ✅  1 💤 0 ❌
5 360 runs  5 350 ✅ 10 💤 0 ❌

Results for commit 38aa3d7.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 77.93%. Comparing base (9f6df5d) to head (38aa3d7).

Files with missing lines	Patch %	Lines
src/argus/spa/spa_settings.py	0.00%	4 Missing ⚠️
src/argus/spa/settings.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1175      +/-   ##
==========================================
- Coverage   78.48%   77.93%   -0.55%     
==========================================
  Files         141      141              
  Lines        5442     5447       +5     
==========================================
- Hits         4271     4245      -26     
- Misses       1171     1202      +31     

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[elfjes]

I am mostly fine with this MR. I would however, keep the ASGI_APPLICATION in the base settings. Users can choose wether they want wsgi or asgi by selecting a webserver or (gunicorn) worker that does one or the other. No need to hide the ASGI_APPLICATION setting the spa settings.