[BP-1.18][FLINK-32999][connectors/hbase] Remove HBase connector code from main repo

[ferenc-csaky]

What is the purpose of the change

Removes HBase connector code from the main repo, as the HBase connector is externalized to the flink-connector-hbase repo. This can only be merged once the external HBase connector is released.

Brief change log

Delete all HBase connector classes and adapt the POMs.

Verifying this change

For the first release, the externalized repo will hace the same content and test coverage as it was in the main repo.
This change added tests and can be verified as follows:

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:

• e0ed53c Azure: SUCCESS

Bot commands

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[snuyanzin]

Thanks for your contribution @ferenc-csaky
the build is still failiing

it seems some more things should be done I addressed them and submitted as a PR to your branch, the build is green after that, please have a look ferenc-csaky#2

[ferenc-csaky]

@snuyanzin can you merge this one as well?

[snuyanzin]

@ferenc-csaky thanks a lot for the contribution

LGTM
As it was discussed during release meeting with @knaufk it is ok to merge it since anyway HBase connector was released together with 1.17 then for 1.18+ it could be removed and externalized