feat: Re-write of directory_writer in Julia

[ChrisO345]

Wrote directory_writer.jl and changed directory_writer.yml to use this file to build directory, rather than using a python script.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9f71176) 97.60% compared to head (de99466) 97.60%. Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #190   +/-   ##
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  Coverage   97.60%   97.60%           
=======================================
  Files         142      142           
  Lines        1796     1796           
=======================================
  Hits         1753     1753           
  Misses         43       43           

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