perf(async): Use tokio_sync's channels instead of futures

[Marwes]

These are slightly faster than the ones from futures so since we
already use tokio there is no harm in using these types instead.

query/simple_getsetdel_async
                        time:   [150.96 us 154.48 us 158.39 us]
                        change: [-30.815% -29.179% -27.560%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 13 outliers among 100 measurements (13.00%)
  6 (6.00%) high mild
  7 (7.00%) high severe

query_pipeline/shared_async_implicit_pipeline
                        time:   [5.5211 ms 5.5509 ms 5.5852 ms]
                        thrpt:  [179.04 Kelem/s 180.15 Kelem/s 181.12 Kelem/s]
                 change:
                        time:   [-11.816% -11.045% -10.262%] (p = 0.00 < 0.05)
                        thrpt:  [+11.436% +12.416% +13.400%]
                        Performance has improved.
Found 11 outliers among 100 measurements (11.00%)
  6 (6.00%) low mild
  3 (3.00%) high mild
  2 (2.00%) high severe
query_pipeline/shared_async_long_pipeline
                        time:   [3.1803 ms 3.1931 ms 3.2065 ms]
                        thrpt:  [311.87 Kelem/s 313.17 Kelem/s 314.44 Kelem/s]
                 change:
                        time:   [-5.9922% -5.4092% -4.8482%] (p = 0.00 < 0.05)
                        thrpt:  [+5.0952% +5.7185% +6.3742%]
                        Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
  2 (2.00%) high mild
  1 (1.00%) high severe