feat: expose participant_active event and joined_at, state fields #1284

Job	Run time
Generating protobuf	13s
Build RTC wheels (AMD64)	1m 29s
Build RTC wheels (x86_64 arm64)	52s
Build RTC wheels (aarch64)	1m 17s
Make RTC sdist	15s
Build RTC wheels (x86_64)	53s
Test (macos-latest, Python 3.14) / Test (macos-latest, Python 3.14)	41s
Test (windows-latest, Python 3.9) / Test (windows-latest, Python 3.9)	1m 49s
Test (ubuntu-latest, Python 3.11) / Test (ubuntu-latest, Python 3.11)	26s
Test (ubuntu-latest, Python 3.9) / Test (ubuntu-latest, Python 3.9)	42s
Test (ubuntu-latest, Python 3.13) / Test (ubuntu-latest, Python 3.13)	34s
Test (ubuntu-latest, Python 3.12) / Test (ubuntu-latest, Python 3.12)	36s
Test (ubuntu-latest, Python 3.14) / Test (ubuntu-latest, Python 3.14)	37s
Test (windows-latest, Python 3.14) / Test (windows-latest, Python 3.14)	59s
Test (windows-latest, Python 3.12) / Test (windows-latest, Python 3.12)	52s
Test (macos-latest, Python 3.9) / Test (macos-latest, Python 3.9)	1m 7s
Test (ubuntu-latest, Python 3.10) / Test (ubuntu-latest, Python 3.10)	37s
Test (macos-latest, Python 3.12) / Test (macos-latest, Python 3.12)	37s
docs	0s
Publish RTC release	-1s
	14m 35s

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