Share modal / Add View option to Permissions dropdown

[ainoc]

Design: https://www.figma.com/file/N0Y3N0nfyMS2wG3gjwZ201/SD-Connect-Prototype?node-id=1324%3A3749&t=vaqMZaxm97Vwk1kN-1

Description

A new view option needs to be added, when sharing without instructing the c4ghtransit plugin to allow re-encrypting headers for another project. For the normal sharing, a separate issue will need to be created for adding a project whitelist additional to the ordinary whitelist, i.e. you can flag containers for access by other projects when needed. This is a separate task from viewing.

Tasks

• add a view option to the sharing menu, that has the same functionality as the current "read, download, copy" option
• add support for whitelisting projects on folders in c4ghtransit
• add support for adding a project to the whitelist in c4ghtransit when sharing with the "read, download and copy" option

[juhtornr]

This is follow up to download features. @sampsapenna will formulate the task better. This is going to need some minor backend changes as well. @blankdots will give this a try.