Add basic _bleio implementation for zephyr-cp port #17720

Job	Run time
scheduler	2m 3s
mpy-cross-mac	48s
tests / zephyr	10m 55s
mpy-cross / build (static-raspbian)	46s
tests / run (native)	45s
tests / run (native_mpy)	40s
tests / run (all)	1m 4s
mpy-cross / build (static-mingw)	43s
mpy-cross / build (static-aarch64)	40s
mpy-cross / build (static)	18s
tests / run (mpy)	41s
docs	0s
windows-zephyr	0s
windows	0s
ports	-1s
	19m 22s

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