ForGroup recreates routable with added group prefix and group middlewares it is grouped to.
Is necessary for Echo.Group to be able to add/register Routable with Router and having group prefix and group middlewares included in actually registered Route.
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Routable is interface for registering Route with Router. During route registration process the Router will convert Routable to RouteInfo with ToRouteInfo method. By creating custom implementation of Routable additional information about registered route can be stored in Routes (i.e. privileges used with route etc.)