feat: add /pallets/errors (#1176)

* add controller and service for errors

* add pallet errors endpoint

* removed unused error query param

* fix newline in response json

* add abstract pallet service

* add AbstractPallerService

* remove dev log

* change access modifier in abstract pallets

* change fn name

* add errors pallet to kusama

* remove unused import
remove newline

* remove lower casing of pallet name in fetchErrors
update latest polkadot e2e tests with PhragmentElection Pallet

* update parsedPalletName