Create @fuel-ts/asm to support script building using SDK

[luizstacio]

As an SDK user needing to create app-specific scripts like a multi-call or others, we should be able to build scripts using the fuel-vm supported instructions like what is possible today on the rust SDK that uses https://github.com/FuelLabs/fuel-asm.

This would replace the current solution that uses [build-time solutions to create script binary].

And delivering a good extendability to the fuels-ts SDK users.

Notes;

• We should keep in mind memoization patterns to avoid rebuilding scripts every time and replace just what is needed.
• Use fuel-asm input/outputs as specs to create = outputs/

Meta code:

const foo = 2;
const program = [
    Op.CALL("0x10", foo, ....), 
    Op.RET(0x01),
];

Reference: #281