feat: distance measurement for line strings

[spectrachrome]

Implemented changes

Enables the map and draw tools to display a geographically accurate distance measurement on the surface of Earth for lines drawn by the user.

Two conditions must be fulfilled in order for the measuring tooltip to appear:

• The draw tools are configured to do measurements (with <eox-drawtools measure>)
• The draw tools' current draw type is LineString.

As long as these are configured, the measuring tooltip should show up automatically, as can be seen in the Distance Measurement story in the Draw Tools.

Due to a large increase in complexity regarding the tooltip alignment, area measurements will not be implemented for now, even if the calculation works fine. If desired, that will follow in another PR.

Screenshots/Videos

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[silvester-pari]

The way it is currently set up would mean we could add this rather as a functionality to eox-map, instead of eox-drawtools, right? Seeing that there is no logic in the drawtools itswelf (besides the overlay clearing)

[silvester-pari]

Is this used anywhere? It would be nice to support both lenght as well as area measurement.

[spectrachrome]

Yes, as currently implemented we would add it as a feature of the map, since that is where the OL interaction is created.

Currently this is not used, since the goal is mostly to determine distances in the GTIF apps. Question with two-dimensional measurements is also how the tooltip should behave (properly centered or stationary in a corner of the map).

[silvester-pari]

We should reconsider if this makes sense this way, as it implements a functionality in the eox-map but "sells" it as drawtools-functionality. Also, I'd suggest we either only support line strings and remove the code regarding area measurement, or we also support area measurement. Plus hopefully we find a way to test the new functionalities...