ConverterFactory for Geometry to Geometry Conversions

A ConverterFactory for JTS Geometry to Geometry conversions could be useful to normalize a geometry to a required type.
One sample implementation is included. It currently supports the following conversions:

• simple to multi (point to multipoint, polygon to multipolygon, etc)
• any to point (gets the barycenter)
• any to linestring (connects all the coordinates with a linestring)
• any to polygon (connects all the coordinates with a closed linestring)
• any to geometrycollection
  A set of testcases are included also.