Enable Ruff d200 rule

[MarcSkovMadsen]

Continues from #982. So review that one first.

I've re-renabled rule D200 in pyproject.toml and applied ruff check --unsafe-fixes.

Then checked the changes manually.

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 87.36%. Comparing base (1868240) to head (f2791e6).

Files with missing lines	Patch %	Lines
param/serializer.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #983   +/-   ##
=======================================
  Coverage   87.35%   87.36%           
=======================================
  Files           9        9           
  Lines        4935     4938    +3     
=======================================
+ Hits         4311     4314    +3     
  Misses        624      624           

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