feat: Add contracts to compile flag to zksolcconfig

[Jrigada]

What 💻

• Added contracts_to_compile to Zksolcconfig and to TestArgs, BuildArgs and ScriptArgs

Why ✋

• Required to be able to compile the desired files when testing, building and scripting.

Evidence 📷

1. zkforge test --contracts-to-compile "Sign.t.sol"

2. 

3. 

[dutterbutter]

@Jrigada thinking about this more deeply. We should also provide the inverse of this.

For example --no-contracts-to-compile which will compile everything but the specified contract(s). I think this is far more useful.

For a practical example, compiling https://github.com/bgd-labs/aave-delivery-infrastructure will fail at first due to the use of EXTCODECOPY in the tests/PayloadScripts.t.sol#L142. Ideally, users would then just run something like zkforge zkbuild --no-contracts-to-compile=PayloadScripts.t.sol. Let's also use ^^ this as a test case.

Thoughts?

[dutterbutter]

@Jrigada works great. Just the one comment.