MXRestClient: Add thirdpartyProtocols to get the third party protocols that can be reached using this HS.
MXRestClient: Add thirdpartyProtocols to get the third party protocols that can be reached using this HS.

Code cleaning

matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk,matrix-org/matrix-ios-sdk