Optimize zip_findlast_entry and add benchmarks

[nhz2]

	main	dirty	main/dirty
reading/ZipReader	0.0427 ± 0.0026 ms	0.0429 ± 0.0027 ms	0.995
reading/zip_findlast_entry first	7.02 ± 0.1 μs	7.45 ± 0.08 μs	0.942
reading/zip_findlast_entry last	0.08 ± 0.01 μs	0.07 ± 0.01 μs	1.14
reading/zip_findlast_entry nothing	5.47 ± 0.27 μs	1.15 ± 0.04 μs	4.75
reading/zip_readentry	5.62 ± 1.2 μs	5.59 ± 1.2 μs	1.01
time_to_load	0.0559 ± 0.00035 s	0.0574 ± 0.00036 s	0.974

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.74%. Comparing base (237b528) to head (25e115e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #81   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files           6        6           
  Lines         791      792    +1     
=======================================
+ Hits          789      790    +1     
  Misses          2        2           

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