[hammer] Allow leaf size to be configured

[AlCutter]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 28.26%. Comparing base (07aa77d) to head (c3007d8).
Report is 61 commits behind head on main.

Files	Patch %	Lines
hammer/hammer.go	0.00%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #148       +/-   ##
===========================================
- Coverage   55.99%   28.26%   -27.73%     
===========================================
  Files           8       15        +7     
  Lines         759     1454      +695     
===========================================
- Hits          425      411       -14     
- Misses        265      964      +699     
- Partials       69       79       +10     

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