Optimize filtering of search results Now the Permission class constructor takes an optional argument 'filter'. Now if we do not find a permission on the whole class *and* all permission objects on the current class with a check method also have a filter method we can improve search performance by filtering in the database (instead of in python).

# https://issues.roundup-tracker.org/issue2551278
# datetime.utcnow deprecated
try:
    from datetime import UTC, datetime

    def utcnow():
        return datetime.now(UTC)

except ImportError:
    from datetime import datetime

    def utcnow():
        return datetime.utcnow()