[Feature] Generate enum that represents the selectors of a call

### Component

sol! macro

### Describe the feature you would like

we generate a list of all selectors:

https://github.com/alloy-rs/core/blob/f7d4a85a089bdab78f122de18492533589df5254/crates/sol-macro-expander/src/expand/contract.rs#L921-L928

it would be nice to have an enum representation for those as well, that match to the functions, similar to functions

https://github.com/alloy-rs/core/blob/f7d4a85a089bdab78f122de18492533589df5254/crates/sol-macro-expander/src/expand/contract.rs#L187-L194

## TODO
* generate a selector enum that supports try_from[u8; 4] etc..

maybe @frankudoags ?

### Additional context

_No response_