Add pallet preimage (needed to annonce a call by it's hash)

changed milestone to %runtime-200

added C-runtime P5-sometimesoon labels

Take example from the polkadot implementation: https://github.com/paritytech/polkadot/blob/release-v0.9.22/runtime/polkadot/src/lib.rs#L278-L292

added D-easy label

added P2-asap label and removed P5-sometimesoon label

changed milestone to %runtime-103

Implemented in 3761fd38

closed