feat: add WebRTC-Direct support #1127

Job	Run time
Test (no logging)	5m 12s
Rust 1.91 MSRV	2m 32s
Documentation	2m 52s
Test (windows-latest)	45m 46s
Clippy	3m 7s
WebRTC Direct five-node devnet	8m 45s
Format Check	14s
Build (ubuntu-latest)	3m 29s
Security Audit	3m 15s
Build (macos-latest)	4m 55s
Test (macos-latest)	32m 47s
Test (ubuntu-latest)	28m 4s
Build (windows-latest)	7m 18s
	2h 28m 16s

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