Initialize Kusama GRANDPA light-client running on Polkadot BridgeHub

The purpose of this call is to initialize the Polkadot side of the Polkadot<>Kusama bridge.

It does the following:

Calls forceXcmVersion on following system parachains to set XCMv3 between:

Polkadot AH <-> Polkadot BH

Polkadot BH -> Kusama BH

Polkadot AH -> Kusama AH

It then calls bridgePolkadotGrandpa::initialize() with the initial configuration for the Kusama on-chain light-cLient running on Polkadot Bridge Hub.

Whitelisted by: https://collectives.subsquare.io/fellowship/referenda/83