Add documentation for the pinot-gcs-filesystem

[elonazoulay]

No description provided.

[codecov-io]

Codecov Report

Merging #4944 into master will increase coverage by 0.97%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master   #4944      +/-   ##
===========================================
+ Coverage     56.33%   57.3%   +0.97%     
+ Complexity       16      12       -4     
===========================================
  Files          1177    1176       -1     
  Lines         63017   62388     -629     
  Branches       9245    9167      -78     
===========================================
+ Hits          35498   35750     +252     
+ Misses        24882   23965     -917     
- Partials       2637    2673      +36

Impacted Files	Coverage Δ	Complexity Δ
...startree/executor/StarTreeAggregationExecutor.java	72.72% <0%> (-27.28%)	0% <0%> (ø)
...ot/controller/helix/core/util/ZKMetadataUtils.java	65.51% <0%> (-24.14%)	0% <0%> (ø)
...nullvalue/RealtimeNullValueVectorReaderWriter.java	85.71% <0%> (-14.29%)	0% <0%> (ø)
...aggregation/function/CountAggregationFunction.java	72.09% <0%> (-13.96%)	0% <0%> (ø)
.../impl/dictionary/LongOffHeapMutableDictionary.java	53.76% <0%> (-11.83%)	0% <0%> (ø)
...pinot/broker/api/resources/PinotClientRequest.java	31.91% <0%> (-10.95%)	0% <0%> (ø)
...a/org/apache/pinot/core/transport/QueryServer.java	79.31% <0%> (-9.98%)	0% <0%> (ø)
...ava/org/apache/pinot/spi/plugin/PluginManager.java	34.44% <0%> (-8.74%)	0% <0%> (ø)
...org/apache/pinot/broker/queryquota/HitCounter.java	92.3% <0%> (-7.7%)	0% <0%> (ø)
...pache/pinot/core/util/SortedRangeIntersection.java	83.82% <0%> (-7.36%)	0% <0%> (ø)
... and 241 more

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[Jackie-Jiang]

Docs are moved to a separate repo