Add support for Report Collaborators Merged

Similar to how you can add Collaborators to Notebooks, this request is to provide an option for being able to specify collaborators for saved views/reports. When saving a View/Report, instead of the current binary checkbox option to "Allow other users to modify this view" which either allows no one other than the creator or everyone one (with the appropriate permissions) to modify the content of the report, you would have an option to be able to specify certain individuals that could modify the view in addition to the creator.