Auto merge of #15780 - Young-Flash:auto_import, r=lnicola

fix: import trait if needed for `unqualify_method_call` assist

before:

![before](https://github.com/rust-lang/rust-analyzer/assets/71162630/66fda67d-afcb-453f-91a9-7e85993c3d2a)

after:

![after](https://github.com/rust-lang/rust-analyzer/assets/71162630/72ffbda4-1615-4413-836e-480eb52e9728)

follow up https://github.com/rust-lang/rust-analyzer/pull/13825
tree: 47d2efdf85173019bc77c1b8de8cc651ed87fa97
  1. .cargo/
  2. .github/
  3. .vscode/
  4. assets/
  5. bench_data/
  6. crates/
  7. docs/
  8. editors/
  9. lib/
  10. xtask/
  11. .editorconfig
  12. .git-blame-ignore-revs
  13. .gitattributes
  14. .gitignore
  15. Cargo.lock
  16. Cargo.toml
  17. LICENSE-APACHE
  18. LICENSE-MIT
  19. PRIVACY.md
  20. README.md
  21. rust-bors.toml
  22. rustfmt.toml
  23. triagebot.toml
README.md

rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.

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