Add to_le_bytes and from_le_bytes

[mborland]

Closes: #72

[cppalliance-bot]

An automated preview of the documentation is available at https://79.safe-numbers.prtest3.cppalliance.org/libs/safe_numbers/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-02-18 17:09:08 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.6%. Comparing base (d1ac39e) to head (894a3a5).
⚠️ Report is 6 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #79     +/-   ##
=========================================
+ Coverage     98.6%   98.6%   +0.1%     
=========================================
  Files          111     112      +1     
  Lines         7209    7363    +154     
  Branches      2476    2523     +47     
=========================================
+ Hits          7105    7259    +154     
  Misses          43      43             
  Partials        61      61             

Files with missing lines	Coverage Δ
include/boost/safe_numbers/byte_conversions.hpp	100.0% <100.0%> (ø)
test/test_to_from_be_bytes.cpp	100.0% <100.0%> (ø)
test/test_to_from_le_bytes.cpp	100.0% <100.0%> (ø)

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