Inline function execution with bytecode evaluation

[jeffcharles]

Description of the change

Updates run_bytecode in javy-core to take an optional function name to execute and execute it if it's provided.

Why am I making this change?

This substantially reduces the amount of fuel to call an exported function with dynamically linked modules. This also allows re-using a runtime after using it when calling compile_src (see #781).

In terms of performance numbers, given a function that looks like:

function run() {
    console.log("hello");
}
run()

Fuel usage will increase from 36,929 to 36,983 (54 instructions).

Given a function that looks like:

export function run() {
    console.log("hello");
}

Fuel usage will decrease from 92,080 to 40,283 (51,797 instructions).

I'm opting to not to update the main.rs file for the time being because I'm planning to have it deleted soon.

Checklist

• I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-core do not require updating CHANGELOG files.
• I've updated the relevant crate versions if necessary. Versioning policy for library crates
• I've updated documentation including crate documentation if necessary.

[saulecabrera]

Very nice! Left a comment/suggestion. I don't think it's blocking, however, I think it's worth considering.