[FLINK-26368] [kafka] Add setProperty method to KafkaSinkBuilder

[gyfora]

What is the purpose of the change

Introduce setProperty method to KafkaSinkBuilder to align it with source builder.

Brief change log

• Added setProperty method

Verifying this change

Added KafkaSinkBuilderTest to test new functionality + modified existing tests to cover this

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): Yes
• The serializers: No
• The runtime per-record code paths (performance sensitive): No
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: No
• The S3 file system connector: No

Documentation

• Does this pull request introduce a new feature? yes
• If yes, how is the feature documented? javadoc

[flinkbot]

CI report:

• eaeb47e Azure: SUCCESS

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[gyfora]

@flinkbot run azure

[gyfora]

@flinkbot run azure

[gyfora]

@morhidi could you please review?

[morhidi]

@morhidi could you please review?

sure, I'll have a look at it later today!

[morhidi]

+1 LGTM, way more elegant than it was before, thanks for contributing !