Implement REMB (Receiver Estimated Maximum Bitrate) #1398

Job	Run time
lint	29s
test (ubuntu-latest, stable)	1m 42s
cargo-deny (aarch64-apple-ios)	22s
test (ubuntu-latest, beta)	1m 39s
cargo-deny (aarch64-linux-android)	23s
test (ubuntu-latest, 1.65.0)	2m 9s
cargo-deny (i686-pc-windows-gnu)	20s
test (macos-latest, stable)	2m 34s
cargo-deny (i686-pc-windows-msvc)	20s
test (macos-latest, beta)	3m 28s
cargo-deny (i686-unknown-linux-gnu)	25s
test (macos-latest, 1.65.0)	4m 47s
cargo-deny (wasm32-unknown-unknown)	22s
test (windows-latest, stable)	2m 43s
cargo-deny (x86_64-apple-darwin)	19s
test (windows-latest, beta)	2m 35s
cargo-deny (x86_64-apple-ios)	18s
test (windows-latest, 1.65.0)	3m 36s
cargo-deny (x86_64-pc-windows-gnu)	22s
cargo-deny (x86_64-pc-windows-msvc)	19s
cargo-deny (x86_64-unknown-linux-gnu)	20s
cargo-deny (x86_64-unknown-redox)	19s
	29m 51s

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