cubicweb #353000 [diet] extract geocoding stuff in its own cube [validation pending]

The gmap views currently need a google-map key. If google map stuff had its own cube, it could define a required gmap-key option in its and would then be easier to reuse.

In addition, the module found in cubicweb-addressbook could be placed in this cube.

done in3.17.0
load left0.000
closed by#7fd6c52ef878 [web/views] extract cube geocoding (closes #353000)
patch[web/views] extract cube geocodable (closes #353000) [applied]