Please provide GeoJson functionality in Azure.Core

[Mohit-Chakraborty]

Library or service name.
Azure.Core

Is your feature request related to a problem? Please describe.
We are working to release a new GA version of Azure.Search.Documents that maps closely with the service features that are in GA.
GeoJson support will be included in the GA library, and we need to switch the dependency from Azure.Core.Experimental to Azure.Core.

[Mohit-Chakraborty]

This is required for #21084

[Mohit-Chakraborty]

cc: @pakrym

[pakrym]

Required for Jun release.