add use for pallet democracy

[todortodorovic]

we need add in pallet democracy
Add additional_runtime_lib_code:

additional_runtime_lib_code = ["use frame_support::traits::EitherOfDiverse;"]

Update Runtime Logic:
Ensure that the runtime supports filtering of additional_runtime_lib_code.
Implement necessary logic to apply this code only when additional_runtime_lib_code is enabled.