Fix data type for password

Source/AwsCommonRuntimeKit/mqtt/Mqtt5Options.swift

@@ -55,7 +55,7 @@
     public let username: String?
 
     /// Opaque binary data that the server may use for client authentication and authorization.
-    public let password: String?
+    public let password: Data?
 
     /// A time interval, in whole seconds, that the client requests the server to persist this connection's MQTT session state for.  Has no meaning if the client has not been configured to rejoin sessions.  Must be non-zero in order to successfully rejoin a session. If the responding CONNACK contains a session expiry property value, then that is the negotiated session expiry value.  Otherwise, the session expiry sent by the client is the negotiated value.
     public let sessionExpiryInterval: TimeInterval?
@@ -84,7 +84,7 @@
     public init (keepAliveInterval: TimeInterval? = nil,
                  clientId: String? = nil,
                  username: String? = nil,
-                 password: String? = nil,
+                 password: Data? = nil,
                  sessionExpiryInterval: TimeInterval? = nil,
                  requestResponseInformation: Bool? = nil,
                  requestProblemInformation: Bool? = nil,
@@ -151,11 +151,11 @@
             _willDelayIntervalSec,
             self.receiveMaximum,
             self.maximumPacketSize) { sessionExpiryIntervalSecPointer,
                                       requestResponseInformationPointer,
                                       requestProblemInformationPointer,
                                       willDelayIntervalSecPointer,
                                       receiveMaximumPointer,
                                       maximumPacketSizePointer in
 
                 raw_connect_options.session_expiry_interval_seconds = sessionExpiryIntervalSecPointer
                 raw_connect_options.request_response_information = requestResponseInformationPointer
@@ -176,11 +176,12 @@
                                 raw_connect_options.user_property_count = userProperties!.count
                                 raw_connect_options.user_properties = UnsafePointer<aws_mqtt5_user_property>(cUserProperties)
                             }
-                            return withOptionalByteCursorPointerFromStrings(
-                                username, password) { cUsernamePointer, cPasswordPointer in
+                            return withOptionalByteCursorPointerFromString(username) { cUsernamePointer in
                                     raw_connect_options.username = cUsernamePointer
-                                    raw_connect_options.password = cPasswordPointer
-                                    return body(raw_connect_options)
+                                    return withAWSByteCursorPointerFromOptionalData(to: password) { cPasswordPointer in
+                                        raw_connect_options.password = cPasswordPointer
+                                        return body(raw_connect_options)
+                                    }
                                 }
                         }
                     }

Test/AwsCommonRuntimeKitTests/mqtt/Mqtt5ClientTests.swift

@@ -392,7 +392,7 @@ class Mqtt5ClientTests: XCBaseTestCase {
         let connectOptions = MqttConnectOptions(
             clientId: createClientId(),
             username: inputUsername,
-            password: inputPassword
+            password: inputPassword.data(using: .utf8)
         )
 
         let clientOptions = MqttClientOptions(
@@ -579,7 +579,7 @@ class Mqtt5ClientTests: XCBaseTestCase {
         let connectOptions = MqttConnectOptions(
             clientId: createClientId(),
             username: inputUsername,
-            password: inputPassword
+            password: inputPassword.data(using: .utf8)
         )
 
         let clientOptions = MqttClientOptions(