MIN: align rainbow open-api with CfRadial1/2

[kmuehlbauer]

• align rainbow open-api with CfRadial1/2
• fix tests
• adapt rainbow/cfradial1 notebooks

needs to be rebased and go in after #57 is merged

[codecov[bot]]

Codecov Report

Merging #58 (86d0e2c) into main (8a0d7f8) will decrease coverage by 1.22%. The diff coverage is 56.52%.

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   84.51%   83.29%   -1.23%     
==========================================
  Files          17       17              
  Lines        3120     3118       -2     
==========================================
- Hits         2637     2597      -40     
- Misses        483      521      +38     

Flag	Coverage Δ
unittests	83.29% <56.52%> (-1.23%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
xradar/io/backends/odim.py	88.10% <33.33%> (+0.12%)	:arrow_up:
xradar/io/backends/rainbow.py	82.76% <50.00%> (-0.05%)	:arrow_down:
xradar/io/backends/gamic.py	85.03% <60.00%> (-1.58%)	:arrow_down:
xradar/io/backends/common.py	64.33% <100.00%> (-24.24%)	:arrow_down:

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[kmuehlbauer]

If there are not complains I'll get this in early next week latest.