Private Datasets: GQL API: Ability to change dataset visibility

[s373r]

"""
Types
"""
input PrivateDatasetVisibilityInput {
	dummy: String
}

input PublicDatasetVisibilityInput {
	anonymousAvailable: Boolean!
}

input DatasetVisibilityInput @oneOf {
	private: PrivateDatasetVisibilityInput
	public: PublicDatasetVisibilityInput
}

"""
Methods
"""
DatasetMut::setVisibility(visibility: DatasetVisibilityInput!): SetDatasetPropertyResultSuccess!

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Based on the "4.5. Use case: Changing dataset visibility" RFC chapter

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• Update test_smart_push_visibility() test

[s373r]

Done via #814