meta: tracking bench APIs

https://github.com/hstreamdb/hstreamdb-rust/tree/bench

------------

- `hstreamdb`
    + `start_client/2`
    + `stop_client/1`
    + `start_producer/3`
    + `stop_producer/1`
    + `to_record/3`
    + `append/2`
    + `append_flush/2`
    + `echo/1`
