Let coroutines dispatch-method be flowable

[sokomishalov]

...Instead of being suspendable and awaiting only for the first emitted element.
And yes, this is a breaking change (however, coroutines API is still marked as experimental).

[codecov]

Codecov Report

Merging #1567 (c02b5f2) into main (9e30d62) will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##               main    #1567      +/-   ##
============================================
- Coverage     78.64%   78.58%   -0.06%     
+ Complexity     6341     6340       -1     
============================================
  Files           477      477              
  Lines         21335    21335              
  Branches       2334     2334              
============================================
- Hits          16779    16767      -12     
- Misses         3479     3491      +12     
  Partials       1077     1077              

Impacted Files	Coverage Δ	Complexity Δ
.../api/coroutines/BaseRedisCoroutinesCommandsImpl.kt	5.55% <0.00%> (ø)	1.00 <0.00> (ø)
.../coroutines/RedisSentinelCoroutinesCommandsImpl.kt	13.63% <0.00%> (ø)	3.00 <0.00> (ø)
...o/lettuce/core/event/command/CommandBaseEvent.java	53.84% <0.00%> (-46.16%)	3.00% <0.00%> (-1.00%)
...n/java/io/lettuce/core/cluster/ClusterCommand.java	70.73% <0.00%> (-17.08%)	18.00% <0.00%> (-1.00%)
...ce/core/masterreplica/SentinelTopologyRefresh.java	84.96% <0.00%> (-0.66%)	35.00% <0.00%> (ø%)
.../io/lettuce/core/dynamic/ReactiveTypeAdapters.java	87.39% <0.00%> (ø)	1.00% <0.00%> (ø%)
.../io/lettuce/core/protocol/ReconnectionHandler.java	79.72% <0.00%> (ø)	22.00% <0.00%> (ø%)
src/main/java/io/lettuce/core/RedisPublisher.java	79.28% <0.00%> (+0.59%)	5.00% <0.00%> (ø%)

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[mp911de]

Thanks a lot, that's merged now for 6.0.2 and 6.1.