Adds missing body to URLRequest mapping.

Author: Miiha

ios/Classes/Types/URLRequest.swift

@@ -63,6 +63,7 @@ extension URLRequest {
             "url": url?.absoluteString,
             "method": httpMethod,
             "headers": allHTTPHeaderFields,
+            "body": httpBody.map(FlutterStandardTypedData.init(bytes:)),
             "iosAllowsCellularAccess": allowsCellularAccess,
             "iosAllowsConstrainedNetworkAccess": iosAllowsConstrainedNetworkAccess,
             "iosAllowsExpensiveNetworkAccess": iosAllowsExpensiveNetworkAccess,