[FLINK-31501][FLINK-31512][table] Move SqlCreateView/SqlAlterView conversion logic to converters

[wuchong]

What is the purpose of the change

Move the conversion logic of SqlCreateView and SqlAlterView from SqlNodeToOperationConversion to converters.

Brief change log

• Introduce SqlCreateViewConverter and move the conversion logic of SqlCreateView -> CreateViewOperation to it.
• Introduce SqlAlterView**Converter and move the conversion logic of SqlAlterView** -> AlterView**Operation to it.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• ae4f904 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[leonardBang]

Thanks @wuchong for the refactor, LGTM