Insert command changes to support vector search

[maheshrajamani]

The documents will use the field name as “$vector” to pass the embedding vector (array of floats).
Insert operations will be changed to add the vector values into query_vector_value if present.

API: /v1/{namespace}/{collection}   
Command: InsertOne
{
  "insertOne": {
    "document": {
      "_id": "doc3",
      "username": "user3",
      "text" : "Welcome to vector search",
      "$vector" : [0.0122,0.2344,....]
    }
   }
}