[js] implement haxe.io.ArrayBufferView.fromBytes()

[zagortenej]

haxe.io.ArrayBufferView.fromBytes() does not exist for JS target as per docs (and source code, ofc): https://api.haxe.org/haxe/io/ArrayBufferView.html

This PR implements fromBytes() for JS target based on how fromBytes() is implemented in /std/haxe/io/ArrayBufferView:

haxe/std/haxe/io/ArrayBufferView.hx

Line 89 in e0b355c

public static function fromBytes(bytes:haxe.io.Bytes, pos = 0, ?length:Int):ArrayBufferView {

.

ArrayBufferViewData for JS target is js.lib.ArrayBufferView which is a helper representing JS TypedArray. Uint8Array is one of the native JS typed arrays, and Haxe UInt8ArrayData has been used to implement fromBytes for JS in similar way it is in the source link above.

UInt8ArrayData for JS target does not unify with ArrayBufferViewImpl from the source link above, however the implementation in this post seems to work on JS target in my tests.