feat: Add fetchAll method for Parse pointers #544

Job	Run time
linux	2m 9s
spm-test	7m 8s
windows	2m 27s
test (platform=iOS\ Simulator,name=iPhone\ 14\ Pro\ Max, test)	10m 59s
test (platform\=tvOS\ Simulator,name\=Apple\ TV, test)	8m 43s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 5\ \(40mm\), build)	2m 28s
test (platform=macOS, test)	7m 23s
cocoapods	3m 41s
docs	2m 41s
xcode-test-5_5	1m 31s
	49m 10s

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