Implement Folder ->  Create or Update Tag

Create or Update a single tag on a folder.

**Input values:**
- FolderId (text)
- Tag Name (text)
- Tag Value (text)

**Output:**
- Same as GetInfoById

**Input validation:**
- If folder doesn't exist:"Folder '{FolderId}' does not exist"
- If the tag does not exist, then ADD the tag to the tags
