Introduce concept of `PermissionGroups` to the `PermissionController`

As it stands, we currently have a 1 to 1 mapping from permission to rpc method. With the addition of multiple rpc methods that fall around the same action or permission, it is necessary for the `PermissionController` to be able to process a permission request for a `parent` permission and subsequently install the `child` permissions. This greatly reduces the visual overload you get from seeing multiple related permissions in the connect screen.

The first permission to have a group would be `snap_manageState` and then eventually the forthcoming custom ui rpc methods.

Spec in Notion: https://www.notion.so/Permission-Groups-7a4047730e8745c2ac17d7714f791dcc