2.2: Promote all Experimental/Beta API to standard

[akarnokd]

This PR promotes all @Experimental/@Beta APIs to standard with version number 2.2.

(In addition, it also fixes remnant markers from earlier promotions in internal files.)

Operators

• Flowable:
  • as
  • blockingSubscribe(..., prefetch) + 2
  • concatMapCompletable + 1
  • concatMapCompletableDelayError + 2
  • concatMapMaybe + 1
  • concatMapMaybeDelayError + 2
  • concatMapSingle + 1
  • concatMapSingleDelayError + 2
  • concatWith + 2
  • groupBy(..., evictingMapFactory)
  • limit
  • mergeWith + 2
  • parallel + 2
  • subscribe(FlowableSubscriber)
  • subscribeOn(..., requestOn)
  • switchMapCompletable
  • switchMapCompletableDelayError
  • switchMapMaybe
  • switchMapMaybeDelayError
  • switchMapSingle
  • switchMapSingleDelayError
  • throttleLatest + 3
• Observable:
  • as
  • concatMapCompletable + 1
  • concatMapCompletableDelayError + 2
  • concatMapMaybe + 1
  • concatMapMaybeDelayError + 2
  • concatMapSingle + 1
  • concatMapSingleDelayError + 2
  • concatWith + 2
  • mergeWith + 2
  • switchMapCompletable
  • switchMapCompletableDelayError
  • switchMapMaybe
  • switchMapMaybeDelayError
  • switchMapSingle
  • switchMapSingleDelayError
  • throttleLatest + 3
• Maybe:
  • mergeDelayError(Publisher, int)
  • as
  • switchIfEmpty
• Single:
  • mergeDelayError + 4
  • as
  • delay(..., delayError) + 1
  • onTerminateDetach
  • retry(long, Predicate)
  • unsubscribeOn
• Completable:
  • fromMaybe
  • as
  • onTerminateDetach
  • retry(long, Predicate)
  • takeUntil
• ConnectableFlowable:
  • refCount + 4
• ConnectableObservable:
  • refCount + 4
• ParallelFlowable:
  • as
  • map(errorHandling) + 1
  • filter(errorHandling) + 1
  • doOnNext(errorHandling) + 1
  • sequentialDelayError + 1
• TestSubscriber/TestObserver (BaseTestConsumer):
  • assertValueAt
  • assertValuesOnly
  • assertValueSetOnly
  • assertValueSequenceOnly
• RxJavaPlugins:
  • setOnParallelAssembly
  • getOnParallelAssembly
  • onAssembly(ParallelFlowable)
• Subjects/FlowableProcessors:
  • BehaviorProcessor.offer
  • PublishProcessor.offer
  • ReplayProcessor.cleanupBuffer
  • ReplaySubject.cleanupBuffer
  • UnicastProcessor.create([...], delayError) + 1
  • UnicastSubject.create([...], delayError) + 1

Interfaces

• CompletableConverter
• CompletableEmitter
• FlowableConverter
• FlowableEmitter
• FlowableSubscriber
• MaybeConverter
• MaybeEmitter
• ObservableConverter
• ObservableEmitter
• SingleConverter
• SingleEmitter
• LambdaConsumerIntrospection
• ParallelFlowableConverter
• ParallelTransformer
• SchedulerRunnableIntrospection

Enums

• ParallelFailureHandling

Classes

• OnErrorNotImplementedException
• ProtocolViolationException
• UndeliverableException
• ParallelFlowable
• MulticastProcessor

Other components

• SchedulerSupport.SINGLE

[vanniktech]

Why 2.1?

[akarnokd]

Anything up to 2.0.7 was promoted for 2.1 but apparently many internal component versions were not properly updated to reflect this change.

[codecov]

Codecov Report

Merging #6105 into 2.x will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #6105      +/-   ##
============================================
- Coverage     98.28%   98.28%   -0.01%     
+ Complexity     6196     6194       -2     
============================================
  Files           667      667              
  Lines         44862    44861       -1     
  Branches       6213     6213              
============================================
- Hits          44092    44090       -2     
- Misses          229      230       +1     
  Partials        541      541

Impacted Files	Coverage Δ	Complexity Δ
...internal/operators/flowable/FlowableDoFinally.java	96.87% <ø> (ø)	3 <0> (ø)	⬇️
...nal/operators/flowable/FlowableMergeWithMaybe.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...ex/internal/operators/parallel/ParallelMapTry.java	98.33% <ø> (ø)	6 <0> (ø)	⬇️
...perators/mixed/ObservableSwitchMapCompletable.java	100% <ø> (ø)	3 <0> (ø)	⬇️
.../java/io/reactivex/processors/ReplayProcessor.java	99.58% <ø> (ø)	52 <0> (ø)	⬇️
.../main/java/io/reactivex/plugins/RxJavaPlugins.java	100% <ø> (ø)	146 <0> (ø)	⬇️
...nal/operators/mixed/ObservableSwitchMapSingle.java	100% <ø> (ø)	3 <0> (ø)	⬇️
...activex/exceptions/ProtocolViolationException.java	100% <ø> (ø)	1 <0> (ø)	⬇️
...ternal/operators/mixed/FlowableConcatMapMaybe.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...rnal/operators/flowable/FlowableTakePublisher.java	100% <ø> (ø)	2 <0> (ø)	⬇️
... and 87 more

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