feat: switch core http to okhttp

[edusperoni]

WIP. Will fill details later.

Notes:

• needs to use the alpha version of the runtime (fixes to kotlin/jvm methods)
• need to wrap okhttp in an async task so we can process the body in the background
• ideally be more lazy with the http processing
• adapt the devtools agent to recieve okhttp results

other than doing some body decoding in the main thread, this implementation already covers all of the current API + cancellation. Ideeally we should have the web spec AbortController ready for this

[mukaschultze]

Uint8Array.from iterates over each element of the source array and copies it to the new array.

If you use pass a java.nio.ByteBuffer as the argument it'll create the TypedArray from a pointer (O(1) performance and no extra memory allocation).

Creating a buffer from 1MB of data takes about ~700ms, wrapping it in a java.nio.ByteBuffer takes only 3ms

toArrayBuffer: () => {
    const arr = raw.toByteArray();
    const bb = java.nio.ByteBuffer.wrap(arr);
    const buffer = ArrayBuffer.from(bb);
    return buffer;
},