Feature/recommend internal ids

[feldlime]

• Added ability to pass internal ids to recommend and recommend_to_items methods and get internal ids back
• Fixed bug in LastNSplitter with incorrect i_split in info

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9b3992e) 100.00% compared to head (68a4bf7) 100.00%.
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #70   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files           45        45           
  Lines         2242      2307   +65     
=========================================
+ Hits          2242      2307   +65     

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