Put default limit for fetching records from GraphQL

[saboonikhil]

On running this query:

query MyQuery {
  historicalAccountBalances {
    accountId
    assetId
    blockNumber
  }
}

Query node goes down with the below result:

This is likely due to elevated volume of records (8510836 for the above query) being pulled at once.

[Chralt98]

I put this to high priority bug right now, because it halted our development process a couple of times now, because I made the mentioned unlimited calls accidentally.