[FLINK-34078][state]Move InternalKeyContext classes from o.a.f.runtim…

[ljz2051]

…e.state.heap to o.a.f.runtime.state package

What is the purpose of the change

(For example: This pull request makes task deployment go through the blob server, rather than through RPC. That way we avoid re-transferring them on each deployment (during recovery).)

This pull request move InternalKeyContext classes from org.apache.flink.runtime.state.heap package to org.apache.flink.runtime.state package.

Brief change log

• move InternalKeyContext and InternalKeyContextImpl to org.apache.flink.runtime.state package.

Verifying this change

This change is a trivial rework without any test coverage.

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? no

[flinkbot]

CI report:

• 9ae5117 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[ljz2051]

@masteryhx Would you please help to review this pr?

[masteryhx]

Thanks for the contribution.
LGTM.