Revert "Revert "169 add withdrawal queue field to subgraph (#170)""

[0xkofee]

reimplement withdrawal queue - This reverts commit 381ec42bb647bf3d6c5abd0cd1660841392d6c79.

[rareweasel]

Are these changes syncing in this subgraph right? https://thegraph.com/hosted-service/subgraph/0xkofee/yearn-ethereum-2

[0xkofee]

yes ser because you can run this query:

{
  vaults(first: 5) {
    id
    withdrawalQueue {
      id,
      name
    }
  }
}