expose participant permissions #1225

Job	Run time
Generating protobuf	14s
Make RTC sdist	12s
Build RTC wheels (AMD64)	1m 38s
Build RTC wheels (x86_64 arm64)	45s
Build RTC wheels (x86_64)	46s
Build RTC wheels (aarch64)	1m 41s
Test (${{ matrix.os }}, Python ${{ matrix.python-version }})	0s
Publish RTC release	0s
docs	0s
	5m 16s

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