feat: adding LRE forward() method

[chanind]

This PR adds a forward() method to the Lre class to match LowRankLre and InvertedLre

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.61%. Comparing base (5fb2681) to head (e95f31b).
Report is 1 commits behind head on main.

Files	Patch %	Lines
linear_relational/Lre.py	88.88%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   90.34%   90.61%   +0.27%     
==========================================
  Files          20       20              
  Lines        1025     1034       +9     
==========================================
+ Hits          926      937      +11     
+ Misses         99       97       -2     

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