Update CODEOWNERS and review-bot for new contracts pallet (#5549)
Created a new @paritytech/smart-contracts team that is now referenced in the review bot config and CODEOWNERS file. Also excluded the new pallet in the other review bot rules.
Created a new @paritytech/smart-contracts team that is now referenced in the review bot config and CODEOWNERS file. Also excluded the new pallet in the other review bot rules.