{Flowable,Observable}.collect(Collector) contravariant on T

[cardamon]

Added ? super twice. Would resolve #7032.

[akarnokd]

Compilation errors:

> Task :compileJava
/home/travis/build/ReactiveX/RxJava/src/main/java/io/reactivex/rxjava3/core/Flowable.java:19807: error: cannot infer type arguments for FlowableCollectWithCollectorSingle<>
        return RxJavaPlugins.onAssembly(new FlowableCollectWithCollectorSingle<>(this, collector));
                                        ^
  reason: inferred type does not conform to equality constraint(s)
    inferred: CAP#1
    equality constraints(s): CAP#1,T
  where T is a type-variable:
    T extends Object declared in class Flowable
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object super: T from capture of ? super T
/home/travis/build/ReactiveX/RxJava/src/main/java/io/reactivex/rxjava3/core/Observable.java:16647: error: cannot infer type arguments for ObservableCollectWithCollectorSingle<>
        return RxJavaPlugins.onAssembly(new ObservableCollectWithCollectorSingle<>(this, collector));
                                        ^
  reason: inferred type does not conform to equality constraint(s)
    inferred: CAP#1
    equality constraints(s): CAP#1,T
  where T is a type-variable:
    T extends Object declared in class Observable
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object super: T from capture of ? super T
2 errors

[cardamon]

Hehe I thought I would get away with not even compiling the sources

[codecov]

Codecov Report

Merging #7033 into 3.x will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.x    #7033      +/-   ##
============================================
- Coverage     99.53%   99.47%   -0.06%     
+ Complexity     6670     6669       -1     
============================================
  Files           742      742              
  Lines         47270    47270              
  Branches       6373     6373              
============================================
- Hits          47048    47022      -26     
- Misses          102      112      +10     
- Partials        120      136      +16     

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/rxjava3/core/Flowable.java	100.00% <ø> (ø)	595.00 <0.00> (ø)
...ain/java/io/reactivex/rxjava3/core/Observable.java	100.00% <ø> (ø)	565.00 <0.00> (ø)
...a3/internal/jdk8/FlowableCollectWithCollector.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...ernal/jdk8/FlowableCollectWithCollectorSingle.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
.../internal/jdk8/ObservableCollectWithCollector.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...nal/jdk8/ObservableCollectWithCollectorSingle.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	89.90% <0.00%> (-6.43%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableFlatMapSingle.java	94.44% <0.00%> (-3.18%)	2.00% <0.00%> (ø%)
...l/operators/observable/ObservableFlatMapMaybe.java	89.43% <0.00%> (-2.82%)	2.00% <0.00%> (ø%)
...a3/internal/subscribers/InnerQueuedSubscriber.java	97.72% <0.00%> (-2.28%)	16.00% <0.00%> (-1.00%)
... and 13 more

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