Rename Single.equals to Single.sequenceEqual

[slisaasquatch]

Renamed Single.equals to Single.sequenceEqual and renamed argument names for consistent naming.

Resolves #6854

[codecov]

Codecov Report

Merging #6856 into 3.x will decrease coverage by 0.07%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                3.x    #6856      +/-   ##
============================================
- Coverage     98.29%   98.22%   -0.08%     
+ Complexity     6381     6379       -2     
============================================
  Files           715      715              
  Lines         46524    46524              
  Branches       6387     6387              
============================================
- Hits          45731    45697      -34     
- Misses          281      297      +16     
- Partials        512      530      +18

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/io/reactivex/rxjava3/core/Single.java	100% <100%> (ø)	151 <1> (ø)	⬇️
...l/operators/observable/ObservableFlatMapMaybe.java	83.8% <0%> (-11.27%)	2% <0%> (ø)
.../operators/flowable/FlowableBlockingSubscribe.java	93.02% <0%> (-4.66%)	10% <0%> (-1%)
.../operators/observable/ObservableFlatMapSingle.java	91.26% <0%> (-3.97%)	2% <0%> (ø)
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0%> (-3.97%)	2% <0%> (ø)
.../internal/disposables/ListCompositeDisposable.java	98% <0%> (-2%)	34% <0%> (-1%)
...internal/operators/flowable/FlowableSwitchMap.java	94.39% <0%> (-1.41%)	3% <0%> (ø)
...a3/internal/operators/flowable/FlowableCreate.java	96.44% <0%> (-1.3%)	6% <0%> (ø)
...eactivex/rxjava3/processors/BehaviorProcessor.java	98.02% <0%> (-0.99%)	49% <0%> (-1%)
...rxjava3/internal/schedulers/ExecutorScheduler.java	95.89% <0%> (-0.92%)	10% <0%> (ø)
... and 11 more

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