[FLINK-14593][client] Port ClusterClient to asynchronous interface version

[tisonkun]

What is the purpose of the change

Port ClusterClient to asynchronous interface version

Brief change log

1. Port ClusterClient to interface
2. Port cancel/cancelWithSavepoint/stopWithSavepoint/getAccumulators to asynchronous version
3. Introduce a settable TestingClusterClient and remove FakeClusterClient
4. Adjust related code.

Verifying this change

This change is a refactor and covered by existing tests.

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)
• If yes, how is the feature documented? (not applicable)

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Automated Checks

Last check on commit 9e4ab5e (Wed Dec 04 15:01:46 UTC 2019)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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Review Progress

• ❓ 1. The [description] looks good.
• ❓ 2. There is [consensus] that the contribution should go into to Flink.
• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 7221802 : SUCCESS Build
• 9e4ab5e : SUCCESS Build

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[tisonkun]

Hi @kl0u @aljoscha could you take a look at this?

[kl0u]

Thanks for the work @tisonkun , I had some comments that you can find here. Let me know what you think.

[tisonkun]

Thanks for your review @kl0u ! I've updated the pull request.

[kl0u]

I think that changes look good @tisonkun ! Please let it run once more on Travis and then feel free to merge.

[tisonkun]

@flinkbot run travis

[tisonkun]

Thanks for your review @kl0u !