Bump optimum to 2.0

[JingyaHuang]

What does this PR do?

Fixes #1015

Optimum released a major 2.0 version which detached some legacy code for backends unrelated to Neuron. The PR aims at supporting Optimum 2.0 and cleaning deprecated code.

[HuggingFaceDocBuilderDev]

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[dacorvo]

Thanks for this pull-request !
Unless I am mistaken, starting with optimum 2.0 we must not have any __init__.py at the top level (i.e. under optimum/neuron: see the explanation.
Other than that, this looks good to me (still an issue with mobilenet in the CI).

[JingyaHuang]

Thanks @dacorvo, will fix the issue in CI. For the init file of neuron, as explained @IlyasMoutawwakil here: huggingface/optimum#2361 (comment), it seems that we don't need to remove it, the change only need to be done on the top level of Optimum main pkg.

[dacorvo]

Thanks @dacorvo, will fix the issue in CI. For the init file of neuron, as explained @IlyasMoutawwakil here: huggingface/optimum#2361 (comment), it seems that we don't need to remove it, the change only need to be done on the top level of Optimum main pkg.

So I was mistaken 😉

[dacorvo]

LGTM, thanks !