feat(core/bench): Add benchmark for concurrent write

[Xuanwo]

This PR will add benchmark for concurrent write.

Seems cool!

service_oss_write_with_concurrent/1
                        time:   [1.3195 s 1.3575 s 1.3909 s]
                        thrpt:  [57.517 MiB/s 58.932 MiB/s 60.630 MiB/s]
service_oss_write_with_concurrent/2
                        time:   [754.59 ms 773.29 ms 795.32 ms]
                        thrpt:  [100.59 MiB/s 103.45 MiB/s 106.02 MiB/s]
service_oss_write_with_concurrent/4
                        time:   [453.25 ms 465.07 ms 476.84 ms]
                        thrpt:  [167.77 MiB/s 172.02 MiB/s 176.50 MiB/s]
service_oss_write_with_concurrent/8
                        time:   [276.45 ms 286.87 ms 300.81 ms]
                        thrpt:  [265.95 MiB/s 278.87 MiB/s 289.39 MiB/s]
Found 1 outliers among 10 measurements (10.00%)

[suyanhanx]

Incredible!