add rshow.py 1d and 2d plotting script with GUI and movie capabilities

[swjones]

add rshow.py

PR Summary

add rshow.py 1d and 2d plotting script with GUI and movie capabilities

PR Checklist

• Adds a test for any bugs fixed. Adds tests for new features.
• Format your changes by using the scripts/format.sh command or by using @par-hermes format
• Document any new features, update documentation for changes made.
• Make sure the copyright notice on any files you modified is up to date.
• LANL employees: make sure tests pass both on the github CI and on the re-git CI
• If ML was used, make sure to add a disclaimer at the top of a file indicating ML was used to assist in generating the file.
• If Agentic AI was used, have the AI generate a "proposed changes" markdown file and store it in the plan_histories folder, with a filename the same as the MR number.

If preparing for a new release, in addition please check the following:

• Update the version in cmake.

[Yurlungur]

should we note this exists in the docs?

[jdolence]

should we note this exists in the docs?

yes. @swjones can you just add something real quick to the docs and then we can merge, assuming you're ready.

[swjones]

@jdolence @jonahm-LANL @Yurlungur added rshow doc to sphinx doc