Add Points Aggregated by Geometry example

[jmgaya]

Background

We've added support in CARTO for Aggregated Geometries, so we should add an example to illustrate such

Change List

• New Map in /test/apps/carto-map/ with such example

[coveralls]

coverage: 91.635%. remained the same
when pulling ccca781 on jmgaya/add-aggregated-geometry-carto-example
into abcff59 on master.