Allow non-admin to share collection in Brand Portal

[#1]

Request for Feature Enhancement (RFE) Summary:	Allow editors and viewers to share their collections with other users of Brand Portal (not share link)
Use-case:	Brand Portal users uses Brand Portal and Assets to self-service with assets and sharing collection would support ideation, team collaboration and system adoption. It would create addition value and likeable feature support system engagement.
Current/Experienced Behavior:	Non-adm users can create collections or smart collections but they cannot share with other Brand Portal and Assets users.
Improved/Expected Behavior:	Non-admin users can share the collections and smart collections they create.
Environment Details (AEM version/service pack, any other specifics if applicable):	Service Manager 6.5
Customer-name/Organization name:	Fabiana Barticioti / British Airways
Screenshot (if applicable):
Code package (if applicable):