Better filenames when using the high level API

[samvanstroud]

Summary

This pull request introduces the following changes

• Better filenames when using the high level API
• Plots are put into nested dir

Relates to the following issues

• Improvements to yuma #223

Conformity

• Changelog entry
• Documentation

[codecov]

Codecov Report

Attention: Patch coverage is 99.04762% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.80%. Comparing base (5865133) to head (979f376).

Files	Patch %	Lines
puma/hlplots/results.py	98.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #256   +/-   ##
=======================================
  Coverage   97.80%   97.80%           
=======================================
  Files          43       43           
  Lines        4637     4656   +19     
=======================================
+ Hits         4535     4554   +19     
  Misses        102      102           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.