impl filters and tests

[shivam-880]

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Does this PR introduce any user-facing change? If yes is this documented?

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[shivam-880]

Initial ideas on what shapes these apis will be taking going forward alongside developments in lib.

query w {
  graph(path: "mygraph1", nodeFilter: {}, edgeFilter: {}) {
    # nodeFilter() {}
    # edgeFitler() {}

    nodes(nodeFilter: {
      or: [
        {and: [{prop: {field: "a", ge: 1}}, {type: ["a","b","c"]}]},
        {prop: {field: "b", any: [1,2,3]}}
      ]
    }) {
      list {
        name
      }
    }
    }
}

query w2 {
  graph(path: "mygraph1") {
    # nodePropertyFilter() {}
    # edgePropertyFitler() {}

    n1: nodes(nodeFilter: {
      and: [{propFilter: {field: "a", ge: 1}}, {typeFilter: ["a","b","c"]}]
    }) {
      list {
        name
      }
    }

    n2: nodes(nodeFilter: {
      propFilter: {field: "a", ge: 1}
    }) {
      list {
        name
      }
    }
    }
}