run: Allow run_config dicts

[jambayk]

Describe your changes

• olive.run python api uses WorkflowRunCommand.
• Let the run_config be dict so that the user can just do olive.run(run_config_dict).
• This was possible before when olive.run used olive.workflows.run instead.

Checklist before requesting a review

• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
• Lint and apply fixes to your code by running lintrunner -a
• Is this a user-facing change? If yes, give a description of this change to be included in the release notes.

(Optional) Issue link