Carve out RAG into different package

[pabvald]

Closes #99

New package (WIP): https://github.com/svilupp/RAGTools

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 88.91%. Comparing base (2600eb9) to head (6e204fd). :warning: Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
- Coverage   92.06%   88.91%   -3.15%     
==========================================
  Files          49       39      -10     
  Lines        4799     3157    -1642     
==========================================
- Hits         4418     2807    -1611     
+ Misses        381      350      -31     

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[svilupp]

Thank you for opening the PR!

Deleting files is easy, it's the imports/references and getting the RAGTools package off the ground.

I don't think we should delete anything until RAGTools.jl is registered and fully functional.