feat: expose participant_active event and joined_at, state fields #1297

Job	Run time
Make RTC sdist	12s
Generating protobuf	34s
Build RTC wheels (AMD64)	1m 14s
Build RTC wheels (x86_64 arm64)	43s
Build RTC wheels (aarch64)	1m 12s
Build RTC wheels (x86_64)	48s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	22s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	24s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	30s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	22s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	29s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	19s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	41s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 20s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	53s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	45s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	17s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	20s
Publish RTC release	0s
docs	0s
	11m 25s

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