[FLINK-35812][Core/API] Move tuple interfaces to flink-core-api

[Zakelly]

What is the purpose of the change

This PR moves classes under package org.apache.flink.api.java.tuple from flink-core module to flink-core-api.

Brief change log

• Move all classes under org.apache.flink.api.java.tuple to flink-core-api.
• The depended org.apache.flink.types.NullFieldException is also moved to flink-core-api.
• All the tuples depend on StringUtils.arrayAwareToString, but it is difficult to move StringUtils. So I copy the single function for tuple use.
• Test org.apache.flink.api.java.tuple.TupleGenerator is left in flink-core, since it depends on the org.apache.flink.util.FileUtils which is also difficult to move.

Verifying this change

This change is a code cleanup and is already 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, Kubernetes/Yarn, 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

[flinkbot]

CI report:

• 480657e Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[Zakelly]

Rebased master....

[reswqa]

Shall we also move and change TupleGenerator?

[Zakelly]

TupleGenerator

I suggest no. The TupleGenerator depend heavily on org.apache.flink.util.FileUtils, which involves more dependencies under org.apache.flink.core.fs.*.

I think we could achieve this when moving classes from org.apache.flink.core.fs to core-api module. WDYT?

[reswqa]

I think we could achieve this when moving classes from org.apache.flink.core.fs to core-api module. WDYT?

Make sense, feel free to merge this % AZP green.

[Zakelly]

Thanks @reswqa , merging...