Support 3rd dimension (Z value) to points for geo_point and points in geo_shapes

[russcam]

Relates: elastic/elasticsearch#25738

Add support for indexing Z value (3rd dimension) points in geo_point and geo_shape. This value is returned on _source documents, and not used in queries

Mapping for geo_point and geo_shape should also support ignore_z_value parameter

[Mpdreamz]

geo_point ignore_z_value is in #3364

Adding a PR for geo_shape now.

[russcam]

Closing as added in #3364