Ability to assign tags to a criteria

[joachimdalen]

As many other items in DevOps uses tags to be able to categorize work, it would be useful for criterias to have tags and to be able to filter on them

If we are to write to tagsMRU the extension needs more permissions

• Load tags from Boards for easy usage
• Keep internal tags state
• Add tag filter to hub
• Create admin interface to manage tags
• Add setting to limit tags to only defined