Add load_openmesh() function for OpenMesh example data

[drorjac]

• Adds load_openmesh() to example_data.py to download and load three OpenMesh datasets (CML, PWS, ASOS reference stations) for a 20-day period over New York City
• Adds notebook section in Explore_example_data.ipynb with a PWS+ASOS accumulated rainfall map, a CML RSL std map, and a time series comparison plot
• Adds tests covering CML coordinates, PWS lon values, and ASOS station IDs/temperature
• Updates CHANGELOG

Note

CI tests will fail until OpenSenseAction/opensense_example_data#6 is merged, as the data files are not yet in the upstream example data repo.

[cchwala]

Thanks @drorjac!

Is the download in the tests failing because the dataset PR has not yet been merged or is there another problem?

EDIT: I saw your comment in the dataset PR that it has to be merged first. Okay. So let's do that!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.90%. Comparing base (6293966) to head (4ea29aa).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   98.88%   98.90%   +0.02%     
==========================================
  Files           7        7              
  Lines         808      823      +15     
==========================================
+ Hits          799      814      +15     
  Misses          9        9              

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[cchwala]

There is a problem with some tests, but this is not stemming from your changes. I opened an issue for this problem, see #121, and we have to fix it separately.

Code and notebook looks good. I am merging this now. Thanks @drorjac for this contribution!