`OutArray`, a possibly typed array. #2606

Job	Run time
doc-lints	42s
unit-test	2m 13s
clippy	1m 34s
godot-itest (macos)	54s
license-guard	30s
godot-itest (windows)	2m 1s
run-examples	1m 12s
rustfmt	18s
godot-itest (linux-full)	2m 15s
godot-itest (linux-features-experimental)	1m 57s
godot-itest (linux-4.1)	46s
godot-itest (linux-memcheck)	2m 21s
godot-itest (linux-memcheck-4.0)	1m 14s
ci-status	3s
	18m 0s

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