Add command line support for slicing by Postman collections

[darrelmiller]

Add parameter to hidi to accept Postman collection as filter:

hidi transform --filterByCollection 'mycollection.json' --input 'openapi.yaml'  --output 'smallOpenApi.yaml'

• Create OpenAPI Tree from input OpenAPI
• Parse the collection into a JsonDocument (System.Text.Json)
• Get list of all paths and methods in collection document
• For Each path/method find Operation in OpenAPI Tree, and add to new OpenAPI document
• Output filtered OpenAPI document.