Implement feature selection for Distance computation

[jtpesone]

Description
In the wizard's proxy processing distance computation, distance is always computed to all the features in the wizard; selection does not have an effect.
In the processing algorithms, the selection is not possible (deactivated)

Repro Steps (wizard)

1. In the wizard Mineral system proxies page, select IOCG Mineral system and Study scale "Regional"
   

2. Press the Process button for "Distance to felsic (meta)volcanic rocks and subvolcanic rocks"

3. Input data can be obtained from johanna.pesonen@gtk.fi. Also available via project's Nextcloud (IOCG dataset). Input vector layer is in the folder "Geolocical data", Selection is to compute distances to Quartzites only, and the Base raster in the folder "Geophysical data/AEM"
   

Below, are the Quartzite polygons in yellow

Below is Wiard's results for the distance to polygons with the Quartzite selection

Thus, computes the distance to the entire study area, not to Quartzites.

Expected behavior
Distance should only be computed to selected featuers

Desktop:

• Plugin: 0.2
• QGIS 3.28.6
• Python: 3.10
• OS: Windows 10

[nmaarnio]

Feature selection is not implemented yet. This is actually a new feature request that will need new implementation on the side of EIS Toolkit.