baggage: Add NewMemberRaw and NewKeyValuePropertyRaw #10079

Job	Run time
compatibility-test (~1.21.3, ubuntu-latest, 386)	57s
lint	1m 53s
test-bench	23s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	28s
compatibility-test (~1.21.3, macos-latest, amd64)	48s
test-coverage	42s
test-race	1m 48s
compatibility-test (~1.21.3, windows-latest, 386)	1m 35s
compatibility-test (~1.21.3, windows-latest, amd64)	3m 35s
compatibility-test (~1.20.10, ubuntu-latest, 386)	59s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	19s
compatibility-test (~1.20.10, macos-latest, amd64)	2m 52s
compatibility-test (~1.20.10, windows-latest, 386)	1m 33s
compatibility-test (~1.20.10, windows-latest, amd64)	3m 25s
test-compatibility	1s
	21m 18s

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