Introduce FolderNameInfo class.

* Introduce FolderNameInfo class for passing down the folder name
suggestions from FolderNameProvider.
* Use FolderNameInfo for storing the serialized suggested names for
Folders. It is parsed and used in FolderEdit.

Bug: 148417030
Bug: 148916551
Bug: 148432151

Change-Id: Idaa81e203cc42889be15d0845230b4508521041c