Tools for creating structured files from native sampler outputs

[mbkuhn]

Summary

one tool is to create a single txt file for every sample directory (every output time). this would make sense for when there are a lot of sample points

one tool is to create a single txt file for a single sample point, constructing the time series. this would make sense for when there is one, or a few, sample points.

Pull request type

Please check the type of change introduced:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Checklist

The following is included:

• new unit-test(s)
• new regression test(s)
• documentation for new capability

This PR was tested by running:

• the unit tests
  • on GPU
  • on CPU
• the regression tests
  • on GPU
  • on CPU

Additional background

Issue Number:

[mbkuhn]

I have "amr-wind path" as an argument for both routines, but that is just to access the amrex particle routines. that may not be necessary, but it makes it easier for a user, I think.