Add new client for Buf/Protocol Buffers #5423

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 9s
test (ubuntu-latest, 28.2, false)	2m 30s
test (ubuntu-latest, 29.4, false)	1m 21s
test (macos-latest, 28.2, false)	3m 57s
test (macos-latest, 29.4, false)	1m 47s
test (windows-latest, 27.2, false)	2m 49s
test (windows-latest, 28.2, false)	3m 9s
test (windows-latest, 29.4, false)	1m 7s
test (ubuntu-latest, snapshot, true)	1m 4s
test (macos-latest, snapshot, true)	1m 36s
test (windows-latest, snapshot, true)	1m 56s
	23m 25s

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