feat: Mark ParseObject and related types as Sendable (#174) #658

Job	Run time
linux	2m 17s
windows	2m 43s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	6m 29s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	5m 5s
spm-test	3m 59s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 14s
test (platform=macOS, test)	7m 2s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 22s
docs	59s
cocoapods	7m 19s
xcode-test-5_5	1m 53s
	40m 22s

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