Merge Geo_Points and Geo_Shape CoreValue Source Type to 1 single Core Value Source Type Geo

[navneet1v]

Description

As part of implementing aggregation on Geo_Shape, we went ahead and enabled the doc values for the GeoShape and CoreValue Source Type for the Geoshape as GEO_SHAPE. During the PR it was suggested if we can combine the GEOPOINT and GEO_SHAPE(code will be added with GeoShape Aggregations Launch) CoreValueSource Type to GEO, rather than having 2 different SourceTypes.

Tasks

• Identify if it is feasible to combine the 2 value source type to 1 CoreValueSource Type.
• Build the Low Level Design for the same.
• Implement the changes to combine