feat: Add SecureEncoder support to PFFileObject #609

Job	Run time
docs	2m 13s
tests (test:ios)	10m 25s
tests (test:macos)	6m 47s
tests (test:parse_live_query:all)	4m 44s
tests (build:starters)	9m 58s
tests (xcode15)	9m 45s
	43m 52s

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