feat: Add fetchAll method for Parse pointers #545

Job	Run time
spm-test	6m 14s
test (platform=iOS\ Simulator,name=iPhone\ 14\ Pro\ Max, test)	13m 9s
linux	2m 25s
windows	2m 39s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	9m 45s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 5\ \(40mm\), build)	2m 26s
test (platform=macOS, test)	8m 10s
docs	1m 26s
cocoapods	8m 2s
xcode-test-5_5	1m 6s
	55m 22s

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