[FLINK-34993] parser changes to support model CRUD sql

[lihaosky]

What is the purpose of the change

Support model CRUD sql syntax

Brief change log

Add following syntax for model

• create model
• drop model
• show model
• show create model
• alter model

Verifying this change

Unit test for parser

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

• Dependencies (does it add or upgrade a dependency): (yes)
• 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): (n)
• 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? (JavaDocs)

[lihaosky]

cc @twalthr , @wuchong

[flinkbot]

CI report:

• d4a91674224599f64157d1290aea01ab0cd54dd0 Azure: SUCCESS

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[lihaosky]

@twalthr , does this repo have CI build? I can't see it