feat: expose participant_active event and joined_at, state fields #1283

Job	Run time
Build RTC wheels (AMD64)	1m 28s
Build RTC wheels (x86_64)	50s
Generating protobuf	29s
Build RTC wheels (aarch64)	1m 22s
Build RTC wheels (x86_64 arm64)	48s
Make RTC sdist	20s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	36s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	1m 15s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	27s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	39s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	40s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	41s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	29s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	1m 34s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	30s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 28s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	27s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	26s
Publish RTC release	0s
docs	0s
	14m 29s

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