fix: dragonflyoss#1644 and #1651 resolve Algorithm to_string and FromStr inconsistency

[cslinwang]

Relevant Issue (if applicable)

Fixes: #1644
Fixes: #1651

Details

This Pull Request addresses the inconsistency between the to_string and FromStr implementations for the Algorithm enum.
Previously:

• The to_string method generated PascalCase outputs (e.g., Zstd).
• The FromStr implementation expected lowercase strings (e.g., zstd).
  This caused parsing issues where the output of to_string could not be used as input for FromStr.

Changes:

1. Refactored the Display trait for the Algorithm enum to ensure to_string produces lowercase strings matching FromStr.
2. Added unit tests to validate consistency and handle invalid inputs.

Types of changes

What types of changes does your PullRequest introduce? Put an x in all the boxes that apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

Go over all the following points, and put an x in all the boxes that apply.

• I have updated the documentation accordingly.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 97.61905% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.01%. Comparing base (acdf021) to head (e22b202).

Files with missing lines	Patch %	Lines
utils/src/compress/mod.rs	97.61%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1656      +/-   ##
==========================================
- Coverage   60.02%   60.01%   -0.01%     
==========================================
  Files         147      147              
  Lines       49583    49624      +41     
  Branches    47037    47078      +41     
==========================================
+ Hits        29761    29784      +23     
- Misses      18041    18056      +15     
- Partials     1781     1784       +3     

Files with missing lines	Coverage Δ
utils/src/compress/mod.rs	97.14% <97.61%> (+0.04%)	⬆️

... and 5 files with indirect coverage changes

[imeoer]

LGTM!