Change SOR paths output to include required b-sdk input

[franzns]

Now returns an array of GqlSorPath:

type GqlSorPath {
    vaultVersion: Int!
    pools: [String]! #list of pool Ids
    tokens: [Token]!
    outputAmountRaw: String!
    inputAmountRaw: String!
}

type Token {
    address: String!
    decimals: Int!
}

Also changed input to also take a vault version (uses both and returns best result by default)