Removed chain property from onUnifiedAccessControlConditionsSelected and replaced it with chains, which is an
array of all the chain types in a given set of conditions e.g. ['ethereum', 'solana', 'polygon', 'xdai'].
Added property authSigTypes to onUnifiedAccesControlConditionsSelected that will contain the types of authSigs the
created set of conditions that need to be passed into saveSigningCondition.authSigs and getSignedToken.authSigs.