2.0 API changes

[comps]

Not implemented yet

• Executor.run_test() should probably create the artifacts dir on its own, if it doesn't exist
  • A pre-existing tmpdir won't be impacted, and it's a nice QoL convenience when writing simple runners
• Remove LocalProvisioner in favor of Generalize LocalProvisioner as a generic Provisioner wrapper #10
• Add duration to Test Artifacts #8
• Have Orchestrators start their Provisioners
  • Would make sense given that any Provisioner is exclusive to an Orchestrator (when used with it) - a Provisioner cannot be shared across Orchestrators mainly due to .clear() usage
  • AI analysis:

    - AdHocOrchestrator.start() -- add prov.start() for each provisioner before the provision loop
    - AdHocOrchestrator.stop() -- add prov.stop() (with try/except, like MultiAggregator) after draining queues
    - SimpleOrchestrator.start()/stop() -- same, for the single provisioner
    - Docstrings in both classes -- change "initialized and started" to "initialized (but not started)" for provisioner params
    - Test in test_adhoc.py:11-49 -- remove the outer with LocalProvisioner() context manager, just pass the bare instance
    

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