Improved TrustedQueryAPI signatures (#6129)
Changed returned type of API methods from `Result<bool, xcm_runtime_apis::trusted_query::Error>` to a typed one `type XcmTrustedQueryResult = Result<bool, xcm_runtime_apis::trusted_query::Error>;` Follow-up of [PR-6039](https://github.com/paritytech/polkadot-sdk/pull/6039) --------- Co-authored-by: Bastian Köcher <[email protected]> Co-authored-by: Adrian Catangiu <[email protected]>