Readpyaro extension

[dulte]

Adds possibility for extra fields from pyaro.

Is dependent on PRs #1115 and #1102, so they should be merged before this PR

Related issue number

fix #1118

Checklist

• [x] Start with a draft-PR
• [x] The PR title is a good summary of the changes
• [x] PR is set to AeroTools and a tentative milestone
• [x] Documentation reflects the changes where applicable
• [x] Tests for the changes exist where applicable
• [x] Tests pass locally
• [x] Tests pass on CI
• [x] At least 1 reviewer is selected
• [x] Make PR ready to review
• [x] Merge #1102
• [x] Merge #1115

[dulte]

Tests will fail until https://github.com/metno/pyaro/pull/25 is merged with the pyaro main dev

[codecov[bot]]

Codecov Report

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

Project coverage is 78.78%. Comparing base (5485b4a) to head (9b4acd6). Report is 629 commits behind head on main-dev.

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1124      +/-   ##
============================================
+ Coverage     78.75%   78.78%   +0.03%     
============================================
  Files           127      127              
  Lines         20105    20101       -4     
============================================
+ Hits          15833    15836       +3     
+ Misses         4272     4265       -7     

Flag	Coverage Δ
unittests	78.78% <100.00%> (+0.03%)	:arrow_up:

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[jgriesfeller]

I took the liberty to finish this up since @dulte is quite busy right now (I need it for some other work). @dulte I'll leave this until tommorrow afternoon in case you want to have a look.