Implement set(double) in NestedMultiOutput

[jruaux]

Added unit test for #1484

[codecov]

Codecov Report

Merging #1486 into main will decrease coverage by 0.01%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##               main    #1486      +/-   ##
============================================
- Coverage     78.83%   78.81%   -0.02%     
- Complexity     6203     6208       +5     
============================================
  Files           461      461              
  Lines         20739    20745       +6     
  Branches       2282     2283       +1     
============================================
+ Hits          16349    16351       +2     
- Misses         3334     3336       +2     
- Partials       1056     1058       +2     

Impacted Files	Coverage Δ	Complexity Δ
...java/io/lettuce/core/output/NestedMultiOutput.java	84.84% <75.00%> (-1.36%)	12.00 <1.00> (+1.00)	⬇️
...a/io/lettuce/core/protocol/ConnectionWatchdog.java	78.43% <0.00%> (-1.31%)	39.00% <0.00%> (ø%)
...java/io/lettuce/core/protocol/DefaultEndpoint.java	69.60% <0.00%> (-0.47%)	99.00% <0.00%> (ø%)
.../io/lettuce/core/dynamic/ReactiveTypeAdapters.java	87.82% <0.00%> (ø)	1.00% <0.00%> (ø%)
.../java/io/lettuce/core/internal/LettuceStrings.java	64.51% <0.00%> (+5.89%)	19.00% <0.00%> (+4.00%)

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[mp911de]

@sokomishalov do you want to go forward and merge this PR to main and 6.0.x?

FTR, squash commits into a single one and edit the commit message to match the Lettuce commit message format (here are two commits for a PR merge: 5810f96 and b240c58). You can add @author Julien Ruaux in the polishing commit.

[sokomishalov]

@mp911de well, looks I did it