Separate prelude imports from star imports

[jjcnn]

Description

Fixes #6119 .

Blocked by #6729, sort of. The failing CI checks are due to the sway-lsp tests being pinned to std v0.48.1, which is from before reexports were introduced. This means that prelude items are not public in those tests, causing asserts in this PR to fail. #6729 will update the sway-lsp tests to use the latest version of std, at which point the CI checks of this PR ought to pass.

Currently, items implicitly imported from the standard library preludes reside in the same namespace as star imports from non-prelude sources. This means that if a star import imports a name that clashes with a name from a prelude, then using that name in the importing module causes an error.

This PR separates the prelude imports into a different namespace, and allows star imports to shadow prelude imports.

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 #6971 will not alter performance

_{Comparing jjcnn/prelude_overridden_by_star_import (eb1aedc) with master (d46f08a)}

Summary

✅ 22 untouched benchmarks