[FLINK-35202][table] Support the execution of alter materialized table set freshness

[hackergin]

What is the purpose of the change

Support the execution of alter materialized table set freshness

Brief change log

• Support convert SqlAlterMaterializedTableFreshness node to operation
• Introduce ModifyRefreshWorkflowCronExpression and Support Modify CronExpression for EmbeddedScheduler
• Support the execution of alter materialized table set freshness

Verifying this change

This change added tests and can be verified as follows:

• Added ITCase in MaterializedTableStatementITCase to verify the change

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? (yes)
• If yes, how is the feature documented? (Will be added in a separated pr)