Display type of the reference index in the schema viewer

[novoj]

In change FgForrest/evitaDB#920 evitaDB started to recognize two types of reference indexes (e.g. three with no index base):

• NONE
• FOR_FILTERING
• FOR_FILTERING_AND_PARTITIONING

Instead of former indexed with values true/false per scope. evitaLab should properly visualize the index type in a chip in reference schema viewer.

Proto:

• GrpcEntitySchema.proto
• GrpcEvitaDataTypes.proto