Experiments on a multi-file reader

[mraspaud]

• Closes Provide an alternative to the YamlReader/FileHandler scheme for better synergy in multi-file datasets #2605
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e20ea41) 95.39% compared to head (4b6398b) 95.39%.
Report is 37 commits behind head on main.

Files	Patch %	Lines
satpy/readers/yaml_reader.py	91.42%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2697   +/-   ##
=======================================
  Coverage   95.39%   95.39%           
=======================================
  Files         371      372    +1     
  Lines       52704    52768   +64     
=======================================
+ Hits        50277    50340   +63     
- Misses       2427     2428    +1     

Flag	Coverage Δ
behaviourtests	4.17% <18.84%> (+0.01%)	⬆️
unittests	96.01% <95.65%> (+<0.01%)	⬆️

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