Rename datapoints

[erikbosch]

Based on a comment at #106 (comment) from @BjoernAtBosch

Should we possibly use data_points instead of datapoints. Most other members in v2 use the form data_point / data_points

If we are to change it, maybe it is good to change it now.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.29%. Comparing base (6763a66) to head (3ccec36).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   59.20%   59.29%   +0.09%     
==========================================
  Files          33       33              
  Lines       16063    16063              
==========================================
+ Hits         9510     9525      +15     
+ Misses       6553     6538      -15     

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[lukasmittag]

LGTM