feat/connectcost: Add support for connections in complexity calculation

[freshjsw]

The cost complexity cost-limit plugin does not take into account how many entities are being returned when either the first or last argument are specified at the field level. This PR supports calculating complexity based on the number of records requested in the query.

This commit fixes #761

These two examples which have the same complexity cost (I have omitted edges and pageInfo to keep these examples simple)

query simpleQuery {
      books {
        title
        author
      }
}

query connectionQuery {
      books(first: 1) {
        title
        author
      }
}

The cost complexity of the query below should increase by a factor of the number of books requested

query connectionQuery {
      books(first: 3) {
        title
        author
      }
}

Note the PR does not currently handle VariableDefinitions but will handle the example above

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Latest commit: 8c0bd568826eedfab2ec03b3dfa1b952651ccc98

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[Urigo]

I think this PR could be closed as it was merged and released here?