Introduced API to allow for extending RedisClusterClient and its connections

[jruaux]

Feature request: #1754

[codecov]

Codecov Report

Merging #1755 (bfbaa8b) into main (31f8635) will increase coverage by 0.00%.
The diff coverage is 92.30%.

@@            Coverage Diff            @@
##               main    #1755   +/-   ##
=========================================
  Coverage     78.26%   78.26%           
- Complexity     6731     6735    +4     
=========================================
  Files           508      508           
  Lines         22682    22686    +4     
  Branches       2465     2465           
=========================================
+ Hits          17752    17756    +4     
+ Misses         3781     3779    -2     
- Partials       1149     1151    +2     

Impacted Files	Coverage Δ
...va/io/lettuce/core/cluster/MultiNodeExecution.java	54.05% <0.00%> (ø)
.../io/lettuce/core/cluster/PipelinedRedisFuture.java	90.90% <ø> (ø)
...va/io/lettuce/core/cluster/RedisClusterClient.java	87.73% <100.00%> (+0.03%)	⬆️
...re/cluster/StatefulRedisClusterConnectionImpl.java	76.41% <100.00%> (+0.68%)	⬆️
...ce/core/masterreplica/SentinelTopologyRefresh.java	81.93% <0.00%> (-1.30%)	⬇️
src/main/java/io/lettuce/core/RedisPublisher.java	78.01% <0.00%> (-0.93%)	⬇️
...cluster/RedisAdvancedClusterAsyncCommandsImpl.java	87.83% <0.00%> (ø)
...ster/RedisAdvancedClusterReactiveCommandsImpl.java	77.71% <0.00%> (ø)
...java/io/lettuce/core/protocol/DefaultEndpoint.java	70.20% <0.00%> (+0.46%)	⬆️
.../io/lettuce/core/dynamic/ReactiveTypeAdapters.java	86.95% <0.00%> (+1.30%)	⬆️

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[sokomishalov]

LGTM

[mp911de]

The changes generally look fine. @jruaux do you plan on adding more commits or do you consider this PR complete?

[jruaux]

I don't plan on adding any more commits. The PR is complete.

[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.