Add module for common utilities

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

* gn3/function_helpers.py: new file

  Provides a new module to hold common programming utilities that are generic
  enough that they will find use across the entire application.

  The first utility function provided in this commit is the `compose`
  function, whose purpose, as indicated by its name, is to take a number of
  functions and compose them into a single function, which when called, will
  return the same result that would have been got had the user called the
  functions in a chain from right to left.

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