moved cli to src/rail/cli/rail_pipe

[eacharles]

Problem & Solution Description (including issue #)

Mostly this just moves stuff to the src/rail/cli/rail_pipe directory, which follows more standard practices and so that we can use python -m rail.cli.rail_pipe

This also make a rail_pipe reduce sub-command and put the rail_pipe reduce roman_rubin command in there.

Code Quality

• My code follows the code style of this project
• I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.31%. Comparing base (da7ac15) to head (e48a304).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #51   +/-   ##
=======================================
  Coverage   97.31%   97.31%           
=======================================
  Files           9        9           
  Lines         447      447           
=======================================
  Hits          435      435           
  Misses         12       12           

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[sidneymau]

looks ok