2.x: deprecate getValues() in Subjects/Processors

[akarnokd]

This PR deprecates the getValues() and getValues(T[]) methods in AsyncSubject, BehaviorSubject, AsyncProcessor and BehaviorProcessor.

These methods were remnants of an early 2.x API design where Subject itself had these methods for the sake of ReplaySubject and SerializedSubject and thus every other subject type had to implement them. The listed subjects and processors above have at most one value accessible via getValue() which can then be assigned to an array index manually if needed.

[codecov]

Codecov Report

Merging #5982 into 2.x will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5982      +/-   ##
============================================
+ Coverage     98.23%   98.26%   +0.03%     
+ Complexity     6053     6050       -3     
============================================
  Files           656      656              
  Lines         44078    44078              
  Branches       6118     6118              
============================================
+ Hits          43299    43314      +15     
+ Misses          236      230       -6     
+ Partials        543      534       -9

Impacted Files	Coverage Δ	Complexity Δ
...n/java/io/reactivex/processors/AsyncProcessor.java	99.08% <ø> (ø)	52 <0> (ø)	⬇️
...in/java/io/reactivex/subjects/BehaviorSubject.java	98.92% <ø> (ø)	54 <0> (ø)	⬇️
.../main/java/io/reactivex/subjects/AsyncSubject.java	99.06% <ø> (ø)	52 <0> (ø)	⬇️
...ava/io/reactivex/processors/BehaviorProcessor.java	98.2% <ø> (ø)	59 <0> (ø)	⬇️
...reactivex/internal/operators/single/SingleAmb.java	96.36% <0%> (-3.64%)	9% <0%> (-1%)
...ternal/operators/observable/ObservablePublish.java	96.46% <0%> (-3.54%)	11% <0%> (ø)
...activex/internal/observers/QueueDrainObserver.java	97.43% <0%> (-2.57%)	21% <0%> (-1%)
...rnal/subscriptions/DeferredScalarSubscription.java	98.46% <0%> (-1.54%)	28% <0%> (-1%)
...a/io/reactivex/internal/util/QueueDrainHelper.java	98.61% <0%> (-1.39%)	57% <0%> (-1%)
...ernal/operators/flowable/FlowableFromIterable.java	93.04% <0%> (-1.07%)	5% <0%> (ø)
... and 21 more

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[artem-zinnatullin]

noice