Added writing reduced statistics for FixedLenByteArray

[potter420]

Hello,

I wrote a small changes to write module to write reduced statistics for FixedLenByteArray as well.

To address the issue here

I don't know how to write macro properly yet so I just simply copy over the function reduce_binary

[codecov-commenter]

Codecov Report

Merging #55 (554ec05) into main (e79e784) will decrease coverage by 0.42%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
- Coverage   67.54%   67.12%   -0.43%     
==========================================
  Files          64       64              
  Lines        3494     3516      +22     
==========================================
  Hits         2360     2360              
- Misses       1134     1156      +22     

Impacted Files	Coverage Δ
src/write/statistics.rs	0.00% <0.00%> (ø)

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