ENH: extract_points from a geospatial raster (#36)

* extract_points function

* ENH: sample_points from a geospatial raster

* streamline crs retrieval

* consistence in user guide titles

* do not use random points

* extract instead of sample for consistency w stars

* retain index if possible

Author: martinfleis

doc/source/api.rst

@@ -54,6 +54,7 @@ Methods
     Dataset.xvec.query
     Dataset.xvec.to_geodataframe
     Dataset.xvec.to_geopandas
+    Dataset.xvec.extract_points
 
 
 DataArray.xvec
@@ -87,4 +88,5 @@ Methods
     DataArray.xvec.set_crs
     DataArray.xvec.query
     DataArray.xvec.to_geodataframe
-    DataArray.xvec.to_geopandas
+    DataArray.xvec.to_geopandas
+    DataArray.xvec.extract_points