Add and fix Clippy lints

[mdekstrand]

This enables Clippy lints and checks them in pre-commit.

[codecov]

Codecov Report

❌ Patch coverage is 89.33333% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.61%. Comparing base (3722c90) to head (58f7ef0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/accel/tasks/mod.rs	14.28%	6 Missing ⚠️
src/accel/als/solve.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1163      +/-   ##
==========================================
- Coverage   89.62%   89.61%   -0.01%     
==========================================
  Files         261      261              
  Lines       17357    17328      -29     
==========================================
- Hits        15556    15529      -27     
+ Misses       1801     1799       -2     

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