Implement Folder -> Move Folder

[cyclops1982]

Move a folder to another folder.

Input:

• FolderId (the folder that you want to move)
• Target Folder Id (the folder that will become the new parent folder of FolderId)

Output:

• Same as GetInfoById of the new Folder.

Input validation:

• If the FolderId does not exist, provide error message "Folder '{Id}' does not exist."
• If the TargetFolderId does not exist, provide error message "Target Folder '{Id}' does not exist."
• If either FolderId or TargetFolderId are not a folder, provide error message "Object with id '{Id}' is not a folder".