Add support for `SPUBLISH`

[atakavci]

Closes/Fixes #2757

implementation is similar to PUBLISH. using existing routing mechanism. some of commented/disabled tests related to SSUBSCRIBE are enabled regarding to TODO notes.

• [X] You have read the contribution guidelines.
• [X] You have created a feature request first to discuss your contribution intent. Please reference the feature request ticket number in the pull request.
• [X] You use the code formatters provided here and have them applied to your changes. Don’t submit any formatting related changes.
• [X] You submit test cases (unit or integration tests) that back your changes.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 63.33333% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 77.64%. Comparing base (43843bf) to head (b906da7). Report is 252 commits behind head on main.

Files	Patch %	Lines
...io/lettuce/core/cluster/PubSubClusterEndpoint.java	60.00%	2 Missing :warning:
...ore/cluster/pubsub/RedisClusterPubSubListener.java	0.00%	2 Missing :warning:
...va/io/lettuce/core/pubsub/RedisPubSubListener.java	0.00%	2 Missing :warning:
...io/lettuce/core/AbstractRedisReactiveCommands.java	0.00%	1 Missing :warning:
...core/cluster/pubsub/RedisClusterPubSubAdapter.java	0.00%	1 Missing :warning:
...ava/io/lettuce/core/pubsub/RedisPubSubAdapter.java	0.00%	1 Missing :warning:
...e/core/pubsub/RedisPubSubReactiveCommandsImpl.java	0.00%	1 Missing :warning:
.../api/coroutines/BaseRedisCoroutinesCommandsImpl.kt	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2838 +/- ## ============================================ - Coverage 78.71% 77.64% -1.07% - Complexity 6786 7238 +452 ============================================ Files 508 539 +31 Lines 22765 24519 +1754 Branches 2446 2607 +161 ============================================ + Hits 17919 19039 +1120 - Misses 3717 4277 +560 - Partials 1129 1203 +74 ```

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