Add label_line_ends and example

[A-CGray]

Purpose

Adds a new helper function that makes it easier to automatically label the ends of lines.

Expected time until merged

2 weeks

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[eytanadler]

This'll be a great addition! I've done it a few times manually so it'll be nice to have as a single function call. I have a few comments

[eytanadler]

*chef's kiss*