Add regular subsampling mode to DataReaderMesh

[kacpnowak]

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

Currently DataReaderMesh allows for random subsampling, so logical extension of this feature is regular subsampling. It should allow to change resolution of data based on regular meshes.

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
• performance

[kacpnowak]

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[github-actions]

Issue assigned to @kacpnowak.