add plot_stations including test

Codecov Report

Attention: Patch coverage is 90.32258% with 3 lines in your changes missing coverage. Please review.

Project coverage is 75.29%. Comparing base (4cc2192) to head (2f2057b).

:exclamation: Current head 2f2057b differs from pull request most recent head e859428

Please upload reports for the commit e859428 to get more accurate results.

Files	Patch %	Lines
kenmerkendewaarden/data_analysis.py	90.32%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #57 +/- ## ========================================== + Coverage 74.69% 75.29% +0.60% ========================================== Files 9 9 Lines 901 927 +26 ========================================== + Hits 673 698 +25 - Misses 228 229 +1 ```

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Deltares-research / kenmerkendewaarden

add plot_stations including test #57

Quality Gate passed

Codecov Report