Support typed arrays Int8Array

[nigelsim]

I am trying to use pako to compress data before saving it to disk. However, it returns Int8Array, which causes ReactNativeBlobUtil to throw an exception TypeError: "data" must be an Array when encoding is "ascii". The work around is to use a spread operator, but this is pretty messy.

Example

import pako from 'pako';

const deflated = pako.gzip(JSON.stringify({'a': 'Some Object'}));
await ReactNativeBlobUtil.fs.writeFile(`${ReactNativeBlobUtil.fs.dir.DocumentDir}/file.gz`, deflated, 'ascii');

react-native-blob-util@0.18.6
pako@1.0.11