feat: customize selection in call

[tusharmath]

Currently in call we can not specify what we need and how deeply nested query we need to issue.

For eg: If we wish to compose f and g using call this is how we set the steps:

type Query {
  f(a: Int, b: Int): F

  g(a: Int, b: Int): G

  fg: H @call(
      steps: [
        { query: "f", args: { a: 1, b: 2 }}
        { query: "g", args: { a: "{{value.fa}}", b: "{{value.fb}}" }}
      ]
    )
}

type F {
  fa: Int
  fb: String
  fc: Boolean
}

type G {
  ga: Int
  gb: String
  gc: Boolean
}

But while calling f or g we don't specify what fields need to be queried for. We wish to change that by providing a field called select.

type Query {
  f(a: Int, b: Int): F
  g(a: Int, b: Int): G
  fg: FG
    @call(
      steps: [
        { query: "f", args: { a: 1, b: 2 }, selection: "{fa fb}" }
        { query: "g", args: { a: 1, b: 2 }, selection: "{ga gb}" }
      ]
    )
}

type F {
  fa: Int
  fb: String
  fc: Boolean
}

type G {
  ga: Int
  gb: String
  gc: Boolean
}

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