attribute-context CLI command

[gsarti]

Description

This PR introduces a new CLI command, inseq attribute-context, to provide a robust and unified implementation of the PECoRe method for detecting and attributing context reliance in language models.

Type of Change

• 🚀 New feature (non-breaking change which adds functionality)

Checklist

• I've read the CODE_OF_CONDUCT.md document.
• I've read the CONTRIBUTING.md guide.
• I've successfully run the style checks using make fix-style.
• I've written tests for all new methods and classes that I created and successfully ran make test.
• I've written the docstring in Google format for all the methods and classes that I used.