## What is the purpose of the change

Inline Flink Kinesis connector with AWS specs related to shard id conventions.
Related Jira story: https://issues.apache.org/jira/browse/FLINK-10422
Mailing list conversation: 
https://lists.apache.org/thread.html/96de3bac9761564767cf283b58d664f5ae1b076e0c4431620552af5b@%3Cdev.flink.apache.org%3E

## Brief change log
  - Remove custom ShardId comparator logic as it's redundant, rely on AWS 
client libs to get shard list with exclusive start shard id
  - Remove test related cleaning in production code
  - Add tests to check correct shards a returned on second run of `listShards` 
method for 2 cases: new shards are present, no new shards

## Verifying this change

This change added tests and can be verified as follows:
  - Run `testGetShardListWithNewShardsOnSecondRun/testGetShardWithNoNewShards` 
unit tests in `KinesisProxyTest.class`

## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency): no
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
  - The serializers: no
  - The runtime per-record code paths (performance sensitive): no
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: no
  - The S3 file system connector: no

## Documentation

  - Does this pull request introduce a new feature? no

[ Full content available at: https://github.com/apache/flink/pull/6760 ]
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