add timeout argument

[zhu0619]

Changelogs

• Add argument timeout to Dataset.upload_to_hub function, to keep the consistency to client function.

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Checklist:

• Was this PR discussed in an issue? It is recommended to first discuss a new feature into a GitHub issue before opening a PR.
• Add tests to cover the fixed bug(s) or the newly introduced feature(s) (if appropriate).
• Update the API documentation if a new function is added, or an existing one is deleted.
• Write concise and explanatory changelogs above.
• If possible, assign one of the following labels to the PR: feature, fix, chore, documentation or test (or ask a maintainer to do it for you).

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The timeout argument is crucial for the success of large dataset uploading.

[cwognum]

👍