add some of zlib

(cherry picked from commit efdf63ff6f8346308f491d3655cbf5471d73d779)

Author: popstarfreas

src/Zlib.res

@@ -0,0 +1,4 @@
+@module("zlib") external deflateRawSync: Buffer.t => Buffer.t = "deflateRawSync"
+@module("zlib") external deflateRaw: (Buffer.t, (. Buffer.t) => unit) => unit = "deflateRaw"
+@module("zlib") external inflateRawSync: Buffer.t => Buffer.t = "inflateRawSync"
+@module("zlib") external inflateRaw: (Buffer.t, (. Buffer.t) => unit) => unit = "inflateRaw"