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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