Sync directory modification time and metadata on the root of the sync #7652

Currently rclone does not sync directory modification time and metadata on the root of the sync.

The syncing was implemented in #6685 and there @nielash noted that the root modification times and metadata weren't being synced.

This is quite hard to fix as there is no way of getting an fs.Directory object for the root from the backend at the moment.

This probably needs a NewEntry method to replace or extend NewObject, or it needs NewFs to return the root directory entry.

This is the same problem that rclone lsjson --stat remote: has - this has no information on the root directory.

PS When this is fixed, take out the notes in cmd/{sync,copy,move} pointing to this issue

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