Add multisig pallet

[WookashWackomy]

The contracts-node has been working great for my team's testing purposes until we run into a need to work with multisig features.

Is it possible to add this pallet into this node? As far as I understand the implementation of pallet_multisig is a matter of a proper configuration (correct me if I'm wrong).

This would be very handy as everyone would be able to test/interact with multisig accounts (which often are owners of contracts) using substrate-contracts-node

[athei]

Yes. I see no reason why not to add it.