baggage: Add NewMemberRaw and NewKeyValuePropertyRaw #10082

Job	Run time
lint	1m 51s
compatibility-test (~1.21.3, ubuntu-latest, 386)	1m 1s
test-bench	21s
compatibility-test (~1.21.3, ubuntu-latest, amd64)	24s
compatibility-test (~1.21.3, macos-latest, amd64)	1m 10s
test-coverage	40s
test-race	1m 43s
compatibility-test (~1.21.3, windows-latest, 386)	3m 21s
compatibility-test (~1.21.3, windows-latest, amd64)	3m 51s
compatibility-test (~1.20.10, ubuntu-latest, 386)	56s
compatibility-test (~1.20.10, ubuntu-latest, amd64)	26s
compatibility-test (~1.20.10, macos-latest, amd64)	59s
compatibility-test (~1.20.10, windows-latest, 386)	2m 39s
compatibility-test (~1.20.10, windows-latest, amd64)	3m 53s
test-compatibility	1s
	23m 16s

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