[Feature] Add a function that convert solidity function signature to selector

[Confucian-e]

Component

primitives

Describe the feature you would like

I've encountered an issue where I can't easily convert a function signature (type: &str) to a selector (type: Selector), like viem's toFunctionSelector or foundry's cast sig.

Additional context

Do you think it would be necessary to add this function? If so, I'd be willing to submit a PR.