[worksheet] allow to provide names for plot ranges for easier lookup and assignment in the plot elements.

Description

Allow to provide names for plot ranges for easier lookup and assignment in the plot elements.

In case no name is provided, we use the current logic and show the start and end values for the data ranges.

Conformity

• Changelog entry
• [ ] Unit tests
• [ ] Update INSTALL
• [ ] Downport
• Fixes: #512 (closed)

When external dependencies are removed

• [ ] Reporting to ...