Add #[error_type] and #[error] attributes

[ironcev]

Description

This PR adds #[error_type] and #[error] attributes to the collection of known attributes, as defined in the ABI Errors RFC.

Additionally, the PR updates the outdated documentation for Attributes and Keywords.

Partially addresses #6765.

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[codspeed-hq]

CodSpeed Performance Report

Merging #7058 will not alter performance

_{Comparing ironcev/error-type-and-error-attributes (2143a9b) with master (d6410e3)}

Summary

✅ 22 untouched benchmarks