fix #1078 - do not throw dropped errors and callback hook

[smaldini]

• add missing onNextDropped hook in Mono.create

[codecov-io]

Codecov Report

Merging #1085 into master will increase coverage by 0.1%.
The diff coverage is 40%.

@@             Coverage Diff             @@
##             master    #1085     +/-   ##
===========================================
+ Coverage     83.65%   83.75%   +0.1%     
- Complexity     3541     3548      +7     
===========================================
  Files           334      334             
  Lines         27675    27676      +1     
  Branches       5182     5182             
===========================================
+ Hits          23152    23181     +29     
+ Misses         2959     2945     -14     
+ Partials       1564     1550     -14

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/reactor/core/publisher/FluxCreate.java	85.82% <0%> (+0.51%)	8 <0> (ø)	⬇️
...c/main/java/reactor/core/publisher/MonoCreate.java	76.14% <100%> (-0.71%)	2 <0> (ø)
...r-core/src/main/java/reactor/core/Disposables.java	89.18% <0%> (-0.46%)	20% <0%> (ø)
...ava/reactor/core/publisher/WorkQueueProcessor.java	69.65% <0%> (-0.43%)	19% <0%> (ø)
...ain/java/reactor/core/publisher/FluxPublishOn.java	86.9% <0%> (+0.2%)	6% <0%> (ø)	⬇️
...rc/main/java/reactor/core/publisher/Operators.java	72.68% <0%> (+0.34%)	94% <0%> (+1%)	⬆️
...java/reactor/core/publisher/FluxBufferTimeout.java	72.72% <0%> (+0.69%)	3% <0%> (ø)	⬇️
...main/java/reactor/core/publisher/SignalLogger.java	72.3% <0%> (+0.76%)	66% <0%> (+1%)	⬆️
... and 10 more

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