Enhancement: add option to get spo folder by id

[martinlingstuyl]

About: https://pnp.github.io/cli-microsoft365/cmd/spo/folder/folder-get/

The spo folder get command allows you to get folders by server relative url.

For completeness I'd suggest we should also be able to get a folder by uniqueId, just like with the file-get command.

Option	Description
-u, --folderUrl [folderUrl]	The server-relative URL of the folder to retrieve. Specify either folderUrl or id but not both.
-i, --id [id]	The UniqueId (GUID) of the folder to retrieve. Specify either folderUrl or id but not both.

The current option name is folderUrl, this will change in v6 to url to align with our naming convention.