impl gql path filter, add tests - #2117

query {
  graph(path: "g") {
    node(name: "a") {
      nodeFilter(filter: {
        and: [
          {
            node: {
              field: NODE_NAME,
              operator: EQUAL,
              value:{ str: "d" }
            }
          },
          {
            property: {
              name: "prop1"
              operator: GREATER_THAN
              value: { i64: 10 }
            }
          }
        ]
      }) {
        outNeighbours {
          list {
            name
          }
        }
      }
    }
  }
}