added handle for class in the to-level main script for job creation API.

[yhwen]

Fixes # .

Description

To support moving the component class into the top-level main script for job creation API.

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Quick tests passed locally by running ./runtest.sh.
• In-line docstrings updated.
• Documentation updated.

[holgerroth]

Looks good.

[holgerroth]

/build