Allow to color lines of CML paths based on cmap

[cchwala]

Things done in this PR:

• [x] add complete docstring to plotting function
• [x] add options to color lines with cmap if a xr.DataArray is passed, but only if there is 0-length time dimension
• [x] Extend example notebook

Thing to check:

• [x] closes #1
• [x] Tests added and passed if fixing a bug or adding a new feature
• [x] All code checks from pre-commit passed
• [x] Added an entry in the CHANGELOG.md file

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (61c4063) 100.00% compared to head (8d6e416) 100.00%. Report is 2 commits behind head on main.

:exclamation: Current head 8d6e416 differs from pull request most recent head f1f112d. Consider uploading reports for the commit f1f112d to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #24 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 3 3 Lines 43 62 +19 ========================================= + Hits 43 62 +19 ```

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