added wgs84/projected_coordinate_system vars with attrs to network file

[veenstrajelmer]

The variable wgs84 or projected_coordinate_system is created to enable dflowfm to distinguish between spherical/cartesian. For interacter, a network seems to be interpreted as cartesian, unless there is this empty wgs84 variable present with at least some of the prescribed attrs. However, in order to let the DeltaShell GUI read the coordinate system properly, probably more is needed. I have also seen a warning message from the kernel for a spherical model:
"** WARNING: Missing coordinate reference system. Now using default: wgs84 (EPSG:4326)."
For cartesian models, there might be even more information like a wkt attribute needed.

Could you provide feedback on what the GUI/kernel (minimally) expects/needs in order to properly read a network file and also where to get this information?

I see the wkt information can come from gdal, but since this is not pip installable I would like to avoid that dependency.

EDIT:
All now works (interacter and QGIS), one additional update is needed to wrap up this PR:

• check whether kernel also knows enough with this minimal epsg writing, there is a warning about a proj string not being read properly.

[sonarcloud]

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