chore(sdk): Format all Python files under SDK folder.

[chensun]

Description of your changes:

• Format all SDK python code using YAPF following: chore: Update yapf config and move it to sdk folder. #6467.
• Format all SDK docstrings using docformatter.

Part of #6500

Checklist:

• The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

[neuromage]

/lgtm

Yay! Thanks so much @chensun!

[ji-yaqi]

/lgtm
Thank you!!

[chensun]

/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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