Add Parent Permission to discovery results

[traylewin]

The discovery feature is very helpful. But it would be ideal if the discover results also included the parent permission of each discovered permission/authority. This could enable other use cases like keeping a cache of the permissions and keys stored across different wallets. This data could be discovered by querying the public chain - it is public info after all, but it would be great if it could be returned with the results of discover.

[WarrickFitz]

The structure returned today looks as follows:

{
  keyToAccountMap: [{
    index: 0,
    key: XXXX,
    accounts: [{
        account: ‘eosio’,
        authorization: ‘owner’
    }]
  },{
    index: 1,
    key: YYYY,
    accounts: [{
        account: ‘anotherAccount’,
        authorization: ‘active’
    },{
        account: ‘anotherAccount’,
        authorization: ‘owner’
    }]
  }]
}

Where Key: XXX or Key: YYY is the Public key for all accounts in the accounts[] for that node.

Getting parent information probably would not be that hard. I'd just need to think about how to add ti to the structure in a nice way and then also make the fetching of that info optional as there are users that don't need the data and are concerned about the extra time it would take to fetch. Good suggestion though, I can see that being helpful.