Additional data needed in contract events endpoint

**Is your feature request related to a problem? Please describe.**
Because there is no `total` key, no `block` number, no timestamp whatsoever, and no way to sort the output (desc/asc), we have to query all the contract events instead of just the data for the last five cycles (all we need).

If we put offset 0, we see the most recent records instead of the oldest records. But to only query the records up until five cycles ago, we don't need ALL contract events (until our loop returns less than the 'limit'), but just until block number or timestamp is 'less than' X.

**Describe the solution you'd like**
I'd like `total`, `blocknumber`, and `timestamp` per event in the output and maybe even a `sort` as query parameter. That way, we can do: `total - total db records = records to retrieve`.

**Endpoint**: https://docs.hiro.so/apis/stacks-blockchain-api/reference/smart-contracts/events
**Link to point in source code:** https://github.com/hirosystems/stacks-blockchain-api/blob/develop/src/api/routes/contract.ts#L100