Menas supports MapType while Standardization does not. Establish parity

## Background
_Menas_ supports `MapType` entry in the schema while _Standardization_ does not reflect this type existence.

## Feature
Establish parity between the component feature, preferably with _Standardization_ extending its support to `MapType` rather then _Menas_ dropping it.

Additionaly - check _Conformance_ compatibility with the type

Start by comparing how Menas handles MapType schema entries with how Standardization handles supported schema types. Then check Conformance for the same type compatibility. Done means Standardization has parity with Menas for MapType and Conformance behavior has been verified, but the issue names no files or tests and is already assigned.

索引モデルが issue の本文から書いたものです。