baggage: Add NewMemberRaw and NewKeyValuePropertyRaw #10083

Job	Run time
lint	1m 47s
test-bench	28s
test-coverage	44s
test-race	1m 48s
compatibility-test (~1.21.3, ubuntu-latest, 386)	52s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	27s
compatibility-test (~1.21.3, macos-latest, amd64)	45s
compatibility-test (~1.21.3, windows-latest, 386)	2m 33s
compatibility-test (~1.21.3, windows-latest, amd64)	3m 13s
compatibility-test (~1.20.10, ubuntu-latest, 386)	57s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	21s
compatibility-test (~1.20.10, macos-latest, amd64)	48s
compatibility-test (~1.20.10, windows-latest, 386)	1m 38s
compatibility-test (~1.20.10, windows-latest, amd64)	4m 7s
test-compatibility	1s
	20m 29s

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