node-api: add support for Float16Array #442

Job	Run time
Build slim tarball	1m 31s
x86_64-linux: with shared libraries	34m 51s
aarch64-linux: with shared libraries	28m 1s
x86_64-darwin: with shared libraries	50m 34s
aarch64-darwin: with shared libraries	32m 48s
	2h 27m 45s

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