Add Brotli support

[aam1r]

zlib now supports Brotli. See:

• zlib: add Brotli support nodejs/node#24938
• https://nodejs.org/api/zlib.html#zlib_zlib_createbrotlicompress_options

Can we add Brotli support in pako as well?

[puzrin]

Node's modules has nothing common with original zlib https://github.com/madler/zlib.