the api now requires you to call an async function initWasm to make the
functions work instead of using top level await. i also optimized the
wasm module to have O3 and fast-math (which the original blurhash
makefile had and the results do seem to be the same with the javascript
blurhash).
I also gave the wasm instance functions inside typescript types and i
fixed a bug where i didnt free the pointers in order so if you called
decode too many times, you will run out of memory.
