Smaller deps using lazy import

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (46a45e6) 83.30% compared to head (0ad2f8c) 83.30%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #111 +/- ## ======================================= Coverage 83.30% 83.30% ======================================= Files 29 29 Lines 671 671 ======================================= Hits 559 559 Misses 112 112 ``` | [Files Changed](https://app.codecov.io/gh/fastrepl/fastrepl/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fastrepl) | Coverage Δ | | |---|---|---| | [fastrepl/eval/metric/sas.py](https://app.codecov.io/gh/fastrepl/fastrepl/pull/111?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fastrepl#diff-ZmFzdHJlcGwvZXZhbC9tZXRyaWMvc2FzLnB5) | `100.00% <100.00%> (ø)` | |

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