perf: generalize specialized full-limb from_*_bytes impl

[DaniPopes]

Motivation

Follow up to #329

Move the specialized from_*_bytes impl to the lowest function

Solution

PR Checklist

• Added Tests
• Added Documentation
• Updated the changelog

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (23fc40f) 80.47% compared to head (4a6074d) 80.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
+ Coverage   80.47%   80.62%   +0.14%     
==========================================
  Files          54       54              
  Lines        6127     6131       +4     
==========================================
+ Hits         4931     4943      +12     
+ Misses       1196     1188       -8     

Files	Coverage Δ
src/bytes.rs	96.18% <100.00%> (+0.06%)	⬆️

... and 5 files with indirect coverage changes

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