unalias base path of rust style import

[taichi-ishitani]

fix #3126

Base path of rust style import should be unaliased if it point alias package but currently not.
This causes #3126.

[codspeed-hq]

Merging this PR will not alter performance

✅ 8 untouched benchmarks

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_{Comparing taichi-ishitani:fix_undefined_identifier (75778b4) with master (08d7ec6)}