Move notificationprofile.Filter stuff to own place

[hmpf]

There are still some "XXX"-marked lines for methods that probably ought to move, but nothing in argus.incident imports the Filter-model or NotifcationProfile-model anymore.

Best reviewed commit by commit.

[github-actions[bot]]

Test results

       7 files     553 suites   21m 42s :stopwatch:    449 tests    448 :heavy_check_mark: 1 :zzz: 0 :x: 3 143 runs  3 136 :heavy_check_mark: 7 :zzz: 0 :x:

Results for commit 440ebf22.

:recycle: This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.99191% with 26 lines in your changes missing coverage. Please review.

Project coverage is 84.36%. Comparing base (cdc23e5) to head (93dbbf8).

Files	Patch %	Lines
src/argus/compat.py	64.00%	9 Missing :warning:
src/argus/filter/filterwrapper.py	93.51%	7 Missing :warning:
src/argus/filter/validators.py	54.54%	5 Missing :warning:
src/argus/filter/filters.py	97.89%	2 Missing :warning:
src/argus/filter/V1/serializers.py	98.07%	1 Missing :warning:
src/argus/filter/checks.py	90.00%	1 Missing :warning:
src/argus/notificationprofile/checks.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #812 +/- ## ========================================== - Coverage 84.81% 84.36% -0.46% ========================================== Files 76 83 +7 Lines 3846 3926 +80 ========================================== + Hits 3262 3312 +50 - Misses 584 614 +30 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
9 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
2.5% Duplication on New Code

See analysis details on SonarCloud