Description:support dynamic load SA

Match-id-abde2643acbee9a6e866fe8f9c964364f6668bb6

sourcehandler/include/load_d_input_source_callback.h

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+/*
+ * Copyright (c) 2022 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LOAD_D_INPUT_SOURCE_CALLBACK_H
+#define LOAD_D_INPUT_SOURCE_CALLBACK_H
+
+#include "system_ability_load_callback_stub.h"
+
+namespace OHOS {
+namespace DistributedHardware {
+namespace DistributedInput {
+class LoadDInputSourceCallback : public SystemAbilityLoadCallbackStub {
+public:
+    explicit LoadDInputSourceCallback(const std::string &params);
+    void OnLoadSystemAbilitySuccess(int32_t systemAbilityId, const sptr<IRemoteObject> &remoteObject) override;
+    void OnLoadSystemAbilityFail(int32_t systemAbilityId) override;
+private:
+    std::string params_;
+};
+}
+}
+}
+#endif