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

It does the following:

Calls forceXcmVersion on following system parachains to set XCMv3 between:

Kusama AH <-> Kusama BH
Kusama BH -> Polkadot BH
Kusama AH -> Polkadot AH

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

Whitelisted by: https://kusama.subsquare.io/fellowship/referenda/62