[OData] provide GraphQL schema layouts

[wtrocki]

Generated schema for OData generates specific names for operations.
Having ability to override names for the operations in some form of config will make this much easier to use for production cases (where we want to have more control on how graphql schema looks)

[ardatan]

Feel free to create a PR and we can support you.

[wtrocki]

Thank you so much! CC @mikepizzo