Add a converter for writing recipes as YAML

[bouweandela]

Description

Closes #issue_number

Link to documentation:

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Checklist

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[codecov]

Codecov Report

❌ Patch coverage is 92.10526% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.20%. Comparing base (61c14ed) to head (47a3bf5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
esmvalcore/_recipe/writer.py	91.42%	6 Missing ⚠️

❌ Your patch check has failed because the patch coverage (92.10%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3143      +/-   ##
==========================================
- Coverage   96.22%   96.20%   -0.03%     
==========================================
  Files         273      274       +1     
  Lines       16150    16223      +73     
==========================================
+ Hits        15541    15608      +67     
- Misses        609      615       +6     

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