3.x: Allow setting the drift tolerance timeunit via system property

[akarnokd]

Adds the new system property rx3.scheduler.drift-tolerance-unit to allow specifying a more fine-grained tolerance amount.

Resolves #6968

[codecov]

Codecov Report

Merging #6969 into 3.x will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## 3.x #6969 +/- ## ============================================ + Coverage 99.60% 99.63% +0.02%  - Complexity 6666 6670 +4  ============================================ Files 742 742 Lines 47248 47254 +6 Branches 6369 6370 +1 ============================================ + Hits 47061 47080 +19  + Misses 60 55 -5  + Partials 127 119 -8 

Impacted Files	Coverage Δ	Complexity Δ
...main/java/io/reactivex/rxjava3/core/Scheduler.java	100.00% <100.00%> (ø)	14.00 <4.00> (+3.00)
...nternal/operators/parallel/ParallelReduceFull.java	91.08% <0.00%> (-3.97%)	2.00% <0.00%> (ø%)
.../internal/disposables/ListCompositeDisposable.java	98.00% <0.00%> (-2.00%)	34.00% <0.00%> (-1.00%)
...tivex/rxjava3/disposables/CompositeDisposable.java	98.14% <0.00%> (-1.86%)	39.00% <0.00%> (-1.00%)
...ternal/operators/flowable/FlowableSubscribeOn.java	98.30% <0.00%> (-1.70%)	2.00% <0.00%> (ø%)
...java3/internal/operators/flowable/FlowableZip.java	98.97% <0.00%> (-1.03%)	6.00% <0.00%> (ø%)
...3/internal/operators/flowable/FlowableGroupBy.java	99.05% <0.00%> (-0.63%)	3.00% <0.00%> (ø%)
...a/io/reactivex/rxjava3/subjects/ReplaySubject.java	98.75% <0.00%> (-0.42%)	49.00% <0.00%> (ø%)
...a3/internal/operators/flowable/FlowableCreate.java	98.70% <0.00%> (-0.33%)	6.00% <0.00%> (ø%)
...l/operators/observable/ObservableFlatMapMaybe.java	91.54% <0.00%> (ø)	2.00% <0.00%> (ø%)
... and 12 more

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