[Doc][Task Plugin] Docs needed for sqoop task

[EricGao888]

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• I had searched in the issues and found no similar feature requirement.

Description

• Currently, DS does not have docs about how to use Sqoop task plugin. We need docs and examples for it.

Documentation Links

• https://dolphinscheduler.apache.org/en-us/docs/latest/user_doc/about/introduction.html

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[EricGao888]

Anyone interested in this issue are welcome to comment here. If no one picks it in a month, I will take it myself : )

[EricGao888]

Seems we've already had an issue here: #8030

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