## What is the purpose of the change

Adds initial support for views in SQL Client. It adds the following statements:
- `CREATE VIEW`: Creates a virtual table from a SQL query. Syntax: 'CREATE VIEW 
<name> AS <query>'
- `SHOW VIEW`: Describes a previously created virtual table. Syntax: 'SHOW VIEW 
<name>'
- `DROP VIEW`: Deletes a previously created virtual table. Syntax: 'DROP VIEW 
<name>'

It also adds the section `views` to environment files.


## Brief change log

- Rewritten statement parser for statements with more than 1 operand
- View support added throughout the SQL Client
- Initial validation of environment files during startup
- Code clean up


## Verifying this change

- `SqlCommandParserTest`
- `ExecutionContextTest`
- `LocalExecutorITCase`

## 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, Yarn/Mesos, 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? docs


[ Full content available at: https://github.com/apache/flink/pull/6606 ]
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