node-api: add support for Float16Array #439

Job	Run time
Build slim tarball	1m 35s
x86_64-linux: with shared libraries	4m 52s
aarch64-linux: with shared libraries	4m 50s
x86_64-darwin: with shared libraries	4m 59s
aarch64-darwin: with shared libraries	4m 56s
	21m 12s

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