Allow for full dynamo config passed to Accelerator

[muellerzr]

What does this PR do?

Accelerator doesn't allow for explicitly passing in TorchDynamoPlugin. This is needed since the TrainingArguments can pass in a mode (and I want to try and remove all env vars from the Trainer)

Fixes # (issue)

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@SunMarc @BenjaminBossan

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[SunMarc]

Thanks for adding this ! LGTM !

[BenjaminBossan]

LGTM, thanks. A test would be nice to have.