import { encode } from "https://deno.land/std@0.201.0/encoding/varint.ts";
Takes unsigned number num and converts it into a VarInt encoded
Uint8Array, returning a tuple consisting of a Uint8Array slice of the
encoded VarInt, and an offset where the VarInt encoded bytes end within the
Uint8Array.
If buf is not given then a Uint8Array will be created.
offset defaults to 0.
If passed buf then that will be written into, starting at offset. The
resulting returned Uint8Array will be a slice of buf. The resulting
returned number is effectively offset + bytesWritten.