* Refact proposal pallet

* Update runtime/rococo/src/propose_parachain.rs

Co-authored-by: Andronik Ordian <[email protected]>

* Fix

* Apply suggestions from code review

Co-authored-by: Andronik Ordian <[email protected]>

* AHH

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Andronik Ordian <[email protected]>
Co-authored-by: Bastian Köcher <[email protected]>