Remove the `args` field from `Container`

[moshewe]

Summary

According to the Argo documentation, container doesn't have an args field at all. It's used to put input parameters, with the input field used to put input artifacts (pulled in from the run_container method). It's counter-intuitive. I think a better solution would be to use the input field solely for the purpose of defining template inputs.

Use Cases

Better alignment with Argo docs, more intuitive code design and more fine grained container template definitions.

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[terrytangyuan]

Would you like to propose changes that are backwards compatible and perhaps add a deprecation warning?

[moshewe]

Deprecating it sounds like a good idea.