feat(forge selectors): cache selectors from abis

[JuaniRios]

What

Closes #12702
Enables forge selectors cache to populate the selector cache from a specific directory of JSON ABIs.

Why

This addresses scenarios where error or transaction decoding is required across multiple contracts or repositories without requiring full compilation of every project.

For example, when building CLI tools or debugging complex flows, users may need to decode data from contracts where they possess the artifacts (ABIs) but do not wish to (or cannot) compile the full source code. This feature allows cast and other tools to utilize a centralized folder of ABIs for resolution.

How

• Adds a new optional flag: --extra-abis-path <PATH>.
• When provided, the command parses all JSON ABIs in the specified folder and adds their selectors to the cache.
• Behavior: This is additive. The command first loads selectors from the provided path, then proceeds with the standard behavior of caching selectors from the current Foundry project.

Open Questions

• Interaction with default behavior: Currently, the command creates a union of the "extra" ABIs and the local project ABIs. Should this flag be mutually exclusive (i.e., only use the folder when the flag is present), or remain additive?

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[grandizzy]

thank you, makes sense, please fix fmt and add comment for the new function
@DaniPopes could you pls have a look too?

[grandizzy]

thank you!