perf(interner): make interner thread-local

[beeb]

No description provided.

[github-actions]

This PR contains breaking changes to the public API.
Please deprecate the old API instead (if possible), or mark the PR with a ! to indicate a breaking change.

cargo-semver-checks summary

--- failure inherent_method_missing: pub method removed or renamed ---

Description:
A publicly-visible method or associated fn is no longer available under its prior name. It may have been renamed or removed entirely.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/inherent_method_missing.ron

Failed in:
Symbol::resolve_with, previously in file /home/runner/work/lintspec/lintspec/BASELINE_BRANCH/crates/lintspec-core/src/interner.rs:15

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 19 untouched benchmarks

---

_{Comparing thread-local-interner (440e80c) with main (253e6e3)}

[beeb]

No perf improvement