## What is the purpose of the change

*This pull request support listing of views*


## Brief change log

  - *Support sql `SHOW VIEWS`*

## Verifying this change

This change added tests and can be verified as follows:

  - *SqlCommandParserTest#testCommands to test command parsing*
  - *LocalExecutorITCase#testListViews*

## 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)


[ Full content available at: https://github.com/apache/flink/pull/6631 ]
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