Implement pyaro-readers using documented API

[magnusuMET]

Change Summary

The current iteration of the pyaro reader assumes one can index into the pyaro object to get a structured numpy element containing the metadata. This PR changes this to implement using the pyaro interface.

In addition this PR tries to read the data into the UngriddedData object more efficiently than line-by-line.

Related issue number

Possible fix for #1302

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 98.73418% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.58%. Comparing base (c8b2b28) to head (38a6cf2).
Report is 6 commits behind head on main-dev.

Files with missing lines	Patch %	Lines
pyaerocom/io/pyaro/read_pyaro.py	98.55%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           main-dev    #1401      +/-   ##
============================================
+ Coverage     78.56%   78.58%   +0.01%     
============================================
  Files           137      137              
  Lines         20905    20883      -22     
============================================
- Hits          16424    16410      -14     
+ Misses         4481     4473       -8     

Flag	Coverage Δ
unittests	78.58% <98.73%> (+0.01%)	⬆️

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[jgriesfeller]

approved