Filter Event Handler Expression

[ccrisan]

No description provided.

[Copilot]

Pull request overview

Adds support for an expression filter on FilterEventHandler so handlers can accept/reject events based on a parsed core expression, and introduces a comprehensive unit test suite for FilterEventHandler filtering and dispatch behavior.

Changes:

• Parse optional filter["expression"] into a core_expressions.Expression during filter preparation.
• Evaluate the filter expression inside accepts() to gate event acceptance.
• Add unit tests covering attribute/value/type filtering, expression filtering, lazy filter preparation, dispatch behavior, and state getters.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
qtoggleserver/lib/filtereventhandler.py	Adds parsing/storage of a filter expression and evaluates it during accepts() to decide whether to handle an event.
tests/unit/qtoggleserver/lib/test_filtereventhandler.py	New unit tests validating filter matching behavior (attrs, transitions, port values, event types, expressions) and handler dispatch/state updates.

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