Is your feature request related to a problem?

Some method names of Table don't clarify whether they work on rows or on columns. Also, summary neither fits the from/to pattern nor does it start with a verb.

Desired solution

• Rename group_by to group_rows_by
• Rename split to split_rows
• Rename summary to summarize_statistics
• Also update the names of test files and the contained tests accordingly.

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