add the possibility to load EE Table as extra layer

[12rambau]

In the current implementation I cannot overlay a vector on top of my images.

Use case:
I'm trying to spot deforestation on fields. Once the risk assessment exerci is done I need to visually assess the fields. An easy way to do it in SEPAl would be to create 2 Planet mosaics, one for the cutting date, one for now, display them in split scree in the second recipe and overlay the fields geometry.

The missing piece is the capacity to load the data (ee.FeatureCollection of course)