Refactor evaluation readers

[mtar]

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

The reader files in packages/evaluation/io are too large and cluttered.

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

[s6sebusc]

Here is is an overview of the current reader classes. Reader and CSVreader live in separate files the rest is in the weathergenreader file.