Add track_caller attr for asser_equal

[l4l]

Without the attribute the panic location is useless, see playground:

thread 'main' panicked at /playground/.cargo/registry/src/index.crates.io-6f17d22bba15001f/itertools-0.13.0/src/lib.rs:4289:17:
Failed assertion Some(1) == Some(2) for iteration 0

Stable since 1.44: rust-lang/rust#72445

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (6814180) to head (f2aec71).
Report is 113 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #976      +/-   ##
==========================================
- Coverage   94.38%   94.35%   -0.04%     
==========================================
  Files          48       49       +1     
  Lines        6665     6710      +45     
==========================================
+ Hits         6291     6331      +40     
- Misses        374      379       +5     

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