fix(weights): define safe manual weights for pallets babe & grandpa

Cargo.lock

runtime/common/Cargo.toml

runtime/common/src/pallets_config.rs

runtime/common/src/weights.rs

runtime/common/src/weights/pallet_babe.rs

runtime/common/src/weights/pallet_balances.rs

runtime/common/src/weights/pallet_grandpa.rs