MS SQL Server table/column comments are not used in the generated GraphQL schema

### Version Information

### Environment

Cloud/ OSS / EE

### What is the current behaviour?

Table and column comments in SQL server are not included in the generated GraphQL schema, and therefore don't show up in in the API explorer (like they do for Postgres).

_Table and column comments definition_

_Table and column comments missing in the API explorer and the schema_

### What is the expected behaviour?
Table and column comments in SQL server are used in the GraphQL schema (like for Postgres).

### How to reproduce the issue?

1. Add comments to a SQL server table and/or column.
2. check out the generated graphql schema.

### Keywords

sql server comments schema

Reproduce the issue by adding comments to a SQL Server table and column, then inspect the generated GraphQL schema and API explorer. Compare the SQL Server result with PostgreSQL, and consider the issue complete when both table and column comments appear in the generated schema and explorer.

Written by the indexing model from the issue text.