Add checker of sequential history

[ligurio]

Implementations:

• cockroachdb https://github.com/jepsen-io/jepsen/blob/main/cockroachdb/src/jepsen/cockroach/sequential.clj
• tidb https://github.com/jepsen-io/jepsen/blob/main/tidb/src/tidb/sequential.clj
• dgraph https://github.com/jepsen-io/jepsen/blob/main/dgraph/src/jepsen/dgraph/sequential.clj