Add token source API for fetching LiveKit tokens #156

Job	Run time
Detect Changes	4s
License Check / License Check	4s
Link Check / Link Check	6s
Generate Docs / Generate and verify docs	24s
Builds / Build (docker-linux-arm64)	36m 20s
C++ Checks / clang-format	23s
Tests / Code Coverage	17m 28s
C++ Checks / clang-tidy	12m 29s
Builds / Build (docker-linux-x64)	45m 21s
Tests / Test (linux-arm64)	9m 3s
Tests / Test (linux-x64)	10m 3s
Builds / Build (macos-x64)	14m 21s
Builds / Build (windows-x64)	31m 15s
Builds / Build (linux-arm64)	7m 25s
Builds / Build (macos-arm64)	4m 20s
Tests / Test (windows-x64)	19m 38s
Tests / Test (macos-arm64)	8m 26s
Builds / Build (linux-x64)	9m 8s
Tests / Test (macos-x64)	15m 4s
Rust Release Check	0s
Builds / Build (cpp-example-collection-linux-arm64)	10m 12s
Builds / Build (cpp-example-collection-x64)	7m 51s
CI	4s
	4h 19m 29s

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