feat: Mark ParseObject and related types as Sendable #655

Job	Run time
windows	2m 28s
linux	2m 32s
spm-test	4m 27s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	7m 27s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	5m 31s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 30s
test (platform=macOS, test)	7m 5s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	2m 6s
xcode-test-5_5	51s
docs	58s
cocoapods	1m 29s
	36m 24s

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