Support OData v4 query POST endpoint in Open API

[dmchughaxway]

Problem description

The following new features exists in OData v4. See https://docs.oasis-open.org/odata/new-in-odata/v4.01/cn04/new-in-odata-v4.01-cn04.html#sec_Newquery
The parsing logic needs to be updated to indicate such a path as a possible route.

Feature request

Update the parsing logic to display a POST endpoint which takes a query payload for each query GET endpoint.