Experimental - Replicated chunk storage

[sachin-j-joshi]

Experimental -
Change log description

1. Implement ReplicatedChunkStorage that wraps multiple instances of chunk storage acting as an ensemble.
   Write quorum - all replicas must succeed.
   Read quorum - at least one replica succeeds.
2. Hack ECS ChunkStorage factory to allow specifying multiple end points and create ensemble
3. Add end to end integration test for ECS
4. Refactor test code to pull out FlakyChunkStorage so that it cane be used widely in other tests.

Purpose of the change
(e.g., Fixes #666, Closes #1234)

What the code does
(Detailed description of the code changes)

How to verify it
(Optional: steps to verify that the changes are effective)

[codecov]

Codecov Report

Base: 86.34% // Head: 86.31% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (209cc1b) compared to base (8a66db8).
Patch coverage: 65.25% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6881      +/-   ##
============================================
- Coverage     86.34%   86.31%   -0.04%     
- Complexity    15910    15947      +37     
============================================
  Files          1027     1029       +2     
  Lines         59273    59386     +113     
  Branches       5997     6007      +10     
============================================
+ Hits          51180    51257      +77     
- Misses         4955     4984      +29     
- Partials       3138     3145       +7     

Impacted Files	Coverage Δ
...ega/storage/extendeds3/ExtendedS3ChunkStorage.java	83.68% <0.00%> (-1.21%)	⬇️
...ain/java/io/pravega/storage/s3/S3ChunkStorage.java	86.98% <0.00%> (-1.05%)	⬇️
...tore/storage/chunklayer/AsyncBaseChunkStorage.java	87.04% <ø> (ø)
...e/chunklayer/ChunkStorageUnavailableException.java	0.00% <0.00%> (ø)
...age/extendeds3/ExtendedS3SimpleStorageFactory.java	57.14% <14.28%> (-42.86%)	⬇️
...ga/storage/extendeds3/ExtendedS3StorageConfig.java	52.17% <34.37%> (-42.28%)	⬇️
...ore/storage/chunklayer/ReplicatedChunkStorage.java	91.54% <91.54%> (ø)
...hared/security/crypto/StrongPasswordProcessor.java	87.50% <0.00%> (-6.25%)	⬇️
...ver/containers/StreamSegmentContainerMetadata.java	96.81% <0.00%> (-0.64%)	⬇️
...a/segmentstore/server/logs/OperationProcessor.java	91.42% <0.00%> (-0.36%)	⬇️
... and 7 more

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