Support for aliased import for encoding v1

[xunilrj]

Description

Fixes #6569

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 #6628 will not alter performance

_{Comparing xunilrj/encoding-auto-impl-aliased-import (c5bec08) with master (3639c54)}

Summary

✅ 22 untouched benchmarks

[IGI-111]

It's ugly but so was the original.
I sure hope we can get proper canonical paths soon and fixup the alias implementation.