Mark VolatileSizeArrayList as RandomAccess list

[mareklangiewicz]

This is needed for generic functions to select appropriate algorithm when searching etc.
Details are in RandomAccess interface javadoc.

[codecov]

Codecov Report

Merging #5324 into 2.x will decrease coverage by 0.1%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #5324      +/-   ##
============================================
- Coverage     96.26%   96.16%   -0.11%     
+ Complexity     5786     5780       -6     
============================================
  Files           630      630              
  Lines         41146    41146              
  Branches       5714     5714              
============================================
- Hits          39608    39566      -42     
- Misses          598      618      +20     
- Partials        940      962      +22

Impacted Files	Coverage Δ	Complexity Δ
...reactivex/internal/util/VolatileSizeArrayList.java	100% <ø> (ø)	30 <0> (ø)	⬇️
...in/java/io/reactivex/subjects/BehaviorSubject.java	85.93% <0%> (-5.73%)	57% <0%> (+1%)
...ernal/operators/flowable/FlowableFromIterable.java	89.83% <0%> (-5.35%)	5% <0%> (ø)
...rnal/subscribers/SinglePostCompleteSubscriber.java	94.87% <0%> (-5.13%)	14% <0%> (-1%)
...a/io/reactivex/internal/util/QueueDrainHelper.java	60.28% <0%> (-4.26%)	32% <0%> (-3%)
.../internal/operators/maybe/MaybeTakeUntilMaybe.java	95.91% <0%> (-4.09%)	2% <0%> (ø)
...rnal/operators/flowable/FlowableTakeLastTimed.java	95.37% <0%> (-3.71%)	2% <0%> (ø)
...vex/internal/operators/flowable/FlowableTimer.java	92.85% <0%> (-3.58%)	2% <0%> (ø)
...ternal/operators/completable/CompletableCache.java	96.96% <0%> (-3.04%)	23% <0%> (-1%)
...ex/internal/operators/maybe/MaybeTimeoutMaybe.java	95.58% <0%> (-2.95%)	2% <0%> (ø)
... and 33 more

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