[Workspace] Add duplicate saved objects API (#6288) (#6555)

* Add copy saved objects API

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* Modify change log

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* Add documents for all saved objects APIs

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* Revert the yml file change

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* Move the duplicate api to workspace plugin

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* Modify change log

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* Modify api doc

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* Check target workspace exists or not

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* Remove unused import

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* Fix test failure

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* Modify change log

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* Modify workspace doc

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* Add more unit tests

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* Some minor change

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* Fix test failure

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* Modify test description

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* Optimize test description

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* Modify test case

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* Minor change

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(cherry picked from commit 7eda01a)
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# Conflicts:
#	CHANGELOG.md

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