Add a ArrayBufferType argument to the constructor

[bsy-nicholasw]

I recently found your other library, Flatbush, and I saw it had shared array buffer support. It looks like it would be trivial to add support in Kdbush?

Thanks for the lightweight + fast libraries!

[mourner]

Sure, good point — feel free to make a PR adding it in the same way it was added in Flatbush.

[mourner]

Done in #48