Pagination for contract logs

[DOBEN]

Task description

Currently, the front-end does not paginate the contract_logs (usually there are only a few) and the rust-backend uses some default pagination setting when generating the connection for the contract_logs rather than filling in the actual pagination info.

let mut connection = connection::Connection::new(true, true);

We might want to add pagination in the future and should update front-end/back-end accordingly for the three chain events that generate contract_logs.

• Back-end update:
  Update the events and the events_as_hex function in the three chain events (contract initialization, contract interrupted and contract updated)

See comment (example for the contract interrupted chain event):
https://github.com/Concordium/concordium-scan/pull/317/files/59ee671424447f42812802def74aba12ec41611a#diff-dfdb365176fded8ddcc1eaa49b01daa4b66523e58aba199706b5c7f3a42b9b35

• Front-end update: