[maps] clean-up ES mvt migration tech debt

[nreese]

#114553 migrated from using mvt's generated by the Kibana server to mvt's generated by Elasticsearch. During this migration, some tech debt was added in order to have this feature make 8.0 FF. These need to be cleaned up in 8.1.

• Remove getMbFieldName from IDynamicStyleProperty interface. DynamicStyleProperty already has a method, getMbPropertyName, for this purpose. getMbPropertyName should be used anywhere getMbFieldName was added.
• Move elasticsearch_util folder from common to public. elasticsearch_util folder was moved to common when Kibana server mvt were originally implemented. Now that elasticsearch_util folder is never used in server, the folder should be moved back to public.
• Refactor classes/layer folder structure. Move all implementations of IVectorLayer into vector_layer folder. This includes moving contents of blended_vector_layer and tiled_vector_layer folder into vector_layer folder. Rename TiledVectorLayer to MvtVectorLayer and rename VectorLayer to GeojsonVectorLayer. [Maps] rename VectorLayer to GeoJsonVectorLayer and TiledVectorLayer to MvtVectorLayer #117207
• Move Elasticsearch specific MVT implementation logic from TiledVectorLayer into a new class called EsMvtVectorLayer.
• [ ] enable gzipping (this is not supported by the v8 ES-JS client) tracked with [Maps] gzip mvt tiles #121822
• consolidate textLayer and labelLayer into single layer [Maps] use single layer for map labels #116840

[elasticmachine]

Pinging @elastic/kibana-gis (Team:Geo)

[elasticmachine]

Pinging @elastic/kibana-presentation (Team:Presentation)

[nreese]

Closing, most items completed and no longer tracking this effort