[FLINK-38760][runtime] Add REST APIs for application query and cancellation

[eemario]

What is the purpose of the change

This pull request adds REST APIs for application query and cancellation.

Brief change log

• Add the REST API /applications/overview
• Add the REST API /applications/:applicationid
• Add the REST API /applications/:applicationid/cancel

Verifying this change

This change added tests and can be verified as follows:

• Added test that validates the REST handler
• Manually verified the change by running a standalone cluster and check the REST response

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, 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? (docs)

[flinkbot]

CI report:

• ea33000 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build