SPIKE: exercise timelock feature in integration-test and test-dapp

[hui-an-yang]

Thanks to Eugene's repo of timelock chest and chest_key generation here https://github.com/ecadlabs/timelock-ts/blob/main/src/timelock_test.ts
After issue #2843, we can look to add integration test and test-dapp interacting with timelock smart contract exercising timelock feature
For example https://gitlab.com/tezos/tezos/-/blob/master/src/proto_019_PtParisA/lib_protocol/contracts/timelock_flip.tz