Can pass a JSON schema to DictParameter and ListParameter

[adrien-berchet]

Description

Add an optional parameter to DictParameter and ListParameter so the loaded value can be validated against a JSON schema.

Motivation and Context

Adding a simple validation step reduces the amount of code in the run method of the tasks. Also, the arguments are checked at the beginning of the workflow so it fails faster, which is always better than failing during the workflow.

Have you tested this? If so, how?

I added simple tests.

[adrien-berchet]

Note that this PR adds the jsonschema dependency. If you prefer I can make it optional.

[dlstadther]

This is a great addition!

However, I'm leaning towards suggesting jsonschema be an optional installation since this is an optional feature usage.

[adrien-berchet]

Cool, thanks!
Ok, I pushed a new commit to make it optional. Now a warning is raised is the user tries to use the new schema parameter while jsonschema is not installed.

[dlstadther]

Thanks!

[adrien-berchet]

With pleasure :)