Api: New filters.

[cyrillkuettel]

Please fill in the commit message below and work through the checklist. You can delete parts that are not needed, e.g. the optional description, the link to a ticket or irrelevant options of the checklist.

Commit message

Api: New filters.

Includes also OGC-3085 which is similar.

TYPE: Feature
LINK: OGC-3086

Checklist

• I have performed a self-review of my code
• I considered adding a reviewer
• I made changes/features for both org and town6
• I have tested my code thoroughly by hand
• I have added tests for my changes/features

[linear]

OGC-3086 Veranstaltung extern publizieren

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.30%. Comparing base (254c81f) to head (4e2c875).
✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
src/onegov/event/collections/occurrences.py	98.23% <100.00%> (+0.09%)	⬆️
src/onegov/event/models/event.py	94.87% <100.00%> (+0.04%)	⬆️
src/onegov/org/views/event.py	82.20% <100.00%> (+0.38%)	⬆️
src/onegov/town6/api.py	70.92% <100.00%> (+1.91%)	⬆️

... and 2 files with indirect coverage changes

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