perf: skip resolving extension alias when `options.extension_alias` is empty

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #203 will not alter performance

_{Comparing perf-extension (05c04b9) with main (1920b55)}

Summary

✅ 2 untouched benchmarks

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.80%. Comparing base (1920b55) to head (05c04b9). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #203 +/- ## ========================================== - Coverage 96.84% 96.80% -0.04% ========================================== Files 11 11 Lines 2284 2288 +4 ========================================== + Hits 2212 2215 +3 - Misses 72 73 +1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.