refactor: Add a `bin_unpack_bin_max` for max-length arrays. #3707

Job	Run time
docker-toxcore-js	2m 36s
docker-fuzzer	13s
docker-bootstrap-node	1m 18s
docker-clusterfuzz	1m 33s
docker-esp32	31s
docker-win32	10s
docker-win64	8s
docker-bootstrap-node-websocket	17s
	6m 46s

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