baggage: Add NewMemberRaw and NewKeyValuePropertyRaw #10081

Job	Run time
lint	1m 42s
test-bench	21s
compatibility-test (~1.21.3, ubuntu-latest, 386)	54s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	23s
compatibility-test (~1.21.3, macos-latest, amd64)	1m 4s
compatibility-test (~1.21.3, windows-latest, 386)	2m 20s
test-coverage	47s
test-race	1m 45s
compatibility-test (~1.21.3, windows-latest, amd64)	2m 20s
compatibility-test (~1.20.10, ubuntu-latest, 386)	1m 5s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	24s
compatibility-test (~1.20.10, macos-latest, amd64)	47s
compatibility-test (~1.20.10, windows-latest, 386)	2m 37s
compatibility-test (~1.20.10, windows-latest, amd64)	3m 56s
test-compatibility	1s
	20m 26s

Provide feedback