Mapping between QueryMsg and QueryResponse

It would be great if we could generate a nice mapping between the query messages and their responses for use in libraries leveraging ts inference.

Example:
```ts
export type QueryMsg = {
simulate_swap: {
ask_asset: AssetEntry
dex?: string | null
offer_asset: AnsAsset
}
}

export interface SimulateSwapResponse {
commission: [AssetEntry, Uint128]
pool: DexAssetPairing
return_amount: Uint128
spread_amount: Uint128
}

export type QueryMsgResponses = {
simulate_swap: SimulateSwapResponse
}
```