Implement module for interfacing with rust-qtlreaper

Issue:
https://github.com/genenetwork/gn-gemtext-threads/blob/main/topics/gn1-migration-to-gn2/clustering.gmi

* gn3/computations/heatmap.py: move `generate_traits_file` function to new
  module
* gn3/computations/qtlreaper.py: new module to interface with the
  `rust-qtlreaper` utility.
* gn3/settings.py: Provide setting for the path to the `rust-qtlreaper`
  utility
* qtlfilesexport.py: Move `random_string` function to new module. Update to
  use functions in new module.

  Provide a module with functions to be used to interface with
  `rust-qtlreaper`. This module essentially contains all the functions that
  are needed to build the files needed for, and to run the qtlreaper utility.

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