Include nomination pools, voterlist, and fast-unstake in Staking proxy filter list

[laboon]

For a Staking proxy, I would think that the follow staking-related pallets would be allowed to be called.

RuntimeCall::VoterList(..)
RuntimeCall::NominationPools(..)
RuntimeCall::FastUnstake(..)

Here:
https://github.com/paritytech/polkadot/blob/master/runtime/polkadot/src/lib.rs#L1035

and for other relevant chains, e.g. Kusama and Westend.

[xlc]

someone should write some tests as well