Feat: Add cumulative dex volumes

[bvotteler]

Split off from #35

[x] Trading volume 7 days per pool [x] Trading volume 24 hours per pool

Added cumulative volumes per pool, containing volume per token of the swap.

Resolves #80

[bvotteler]

7-day, 24-hour volumes can be calculated using the cumulative volumes. See this comment for example queries.

[bvotteler]

This is what a 7-day volume query could look like: Query:

fragment AmountFields on PooledAmount {
    amount
    amountHuman
    token {
      ... on NativeToken {
        __typename
        token
      }
      ... on ForeignAsset {
        __typename
        asset
      }
      ... on StableLpToken {
        __typename
        poolId
      }
    }
}

fragment PoolVolumeFields on CumulativeDexTradingVolumePerPool {
    poolId
    poolType
    tillTimestamp
    amounts {
      ...AmountFields
    }
}

query poolVolumes($start: DateTime, $end: DateTime, $poolIdSubstr1: String, $poolIdSubstr2: String) {
  startVolumes: cumulativeDexTradingVolumePerPools(limit: 1, orderBy: tillTimestamp_DESC, where: {poolId_contains: $poolIdSubstr1, tillTimestamp_lte: $start, AND: {poolId_contains: $poolIdSubstr2}}) {
    ...PoolVolumeFields
  }
  endVolumes: cumulativeDexTradingVolumePerPools(limit: 1, orderBy: tillTimestamp_DESC, where: {poolId_contains: $poolIdSubstr1, tillTimestamp_lte: $end, AND: {poolId_contains: $poolIdSubstr2}}) {
    ...PoolVolumeFields
  }
}

eg. using these parameter values

{
  "poolIdSubstr1": "KBTC",
  "poolIdSubstr2": "KSM",
  "start": "2023-02-01T00:00:00.000000Z",
  "end": "2023-02-08T00:00:00.000000Z"
}

[bvotteler]

@bvotteler This looks good to me, approving now. This comment does not need to be handled as we are sure other types of currencies won't be used, right? https://github.com/interlay/interbtc-squid/pull/81/files#r1106863865

Yes, I am assuming this holds true until our types are updated to include those. When that happens, the interbtc-types definition here will need to be updated, too, at which point we know squid needs to follow suit.