Aleix Conchillo Flaqué 2a572aedba Simplify ServiceSwitcher with closure-based filters ...

- Make ServiceSwitcherStrategy inherit from BaseObject with properties
  for services and active_service, and move initial service selection
  into the base class
- Add on_service_switched event to ServiceSwitcherStrategy
- handle_frame now returns the switched-to service (or None), allowing
  ServiceSwitcher to swallow ManuallySwitchServiceFrame on switch and
  request metadata from the new active service
- Override push_frame to suppress RequestMetadataFrame and
  ServiceMetadataFrame from inactive services
- Remove ServiceSwitcherFilter and ServiceSwitcherFilterFrame in favor
  of plain FunctionFilter instances with closures that check the
  strategy's active service directly
- FunctionFilter: add FilterType alias
- FunctionFilter: when direction is None, frames in both directions
  are filtered instead of just one
- Add docstrings to ServiceSwitcher and its components

2026-02-09 14:12:33 -05:00

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