baggage: Add NewMemberRaw and NewKeyValuePropertyRaw #10078

Job	Run time
lint	1m 46s
test-bench	20s
compatibility-test (~1.21.3, ubuntu-latest, 386)	52s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	30s
test-coverage	48s
compatibility-test (~1.21.3, macos-latest, amd64)	51s
test-race	1m 41s
compatibility-test (~1.21.3, windows-latest, 386)	2m 40s
compatibility-test (~1.21.3, windows-latest, amd64)	3m 31s
compatibility-test (~1.20.10, ubuntu-latest, 386)	59s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	22s
compatibility-test (~1.20.10, macos-latest, amd64)	57s
compatibility-test (~1.20.10, windows-latest, 386)	2m 33s
compatibility-test (~1.20.10, windows-latest, amd64)	4m 22s
test-compatibility	1s
	22m 13s

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