Double the chunk size for f64

[Shnatsel]

Zen4: Improves performance for very small and very large sizes, regresses medium sizes.
M4: Improvement or neutral across the board.

Benchmarks (of the size doubled across the board, even for f32):

double_up_results_zen4.txt

double_up_results_m4.txt

Later we can choose the fastest bit reversal method at runtime, like in #60, but this is a good first step.

Results of cargo run --release --features=parallel --example benchmark -- 64 27 5

Zen4: 1,629,803,842 -> 1,476,104,938
M4: 947,283,858 -> 810,994,608

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.10%. Comparing base (2cf6951) to head (6bc1d8c).

Files with missing lines	Patch %	Lines
src/algorithms/bravo.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #86   +/-   ##
=======================================
  Coverage   99.10%   99.10%           
=======================================
  Files          10       10           
  Lines        1566     1566           
=======================================
  Hits         1552     1552           
  Misses         14       14           

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