Clean up CsvReader

[mtar]

Describe the task. It can be a feature, documentation, etc.

Related: #1731

The CsvReader in the evaluation package has incomplete or outdated docstrings and assertions can be changed to exceptions.

Hedgedoc URL, if you are keeping notes, plots, logs in hedgedoc.

No response

Area

• datasets, data readers, data preparation and transfer
• model
• science
• infrastructure and engineering
• evaluation, export and visualization
• documentation

[mtar]

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[github-actions]

Issue assigned to @mtar.