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feat: add Monitor class for document-level component event monitoring

Introduces a Monitor class that listens to component lifecycle and transition
events at the document level, with configurable log levels (DEBUG, INFO, WARN,
ERROR). The implementation includes:

- Hierarchical log levels where DEBUG includes all events, WARN/INFO include
  transition events only, and ERROR has zero listeners (no overhead).
- Protected setupXxx() hooks and on() method for easy extensibility, allowing
  subclasses to add custom event handlers while preserving automatic listener
  cleanup on level changes or monitor stop.
- Proper state machine requiring explicit start() before setLevel(), with
  stop() for complete listener removal.
- Full test coverage including custom monitor extension verification.

Implements #13

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