Remove getters from pallet-membership (#4840)
As per #3326 , removes pallet::getter macro usage from pallet-membership. The syntax StorageItem::<T, I>::get() should be used instead. Also converts some syntax to turbo and reimplements the removed getters, following #223 cc @muraca --------- Co-authored-by: Dónal Murray <[email protected]> Co-authored-by: Kian Paimani <[email protected]>