Refactor am services

Use the new service naming scheme.
Remove redundant casts and template specifiers in response.Push.

app/src/main/cpp/skyline/services/am/IApplicationProxyService.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <services/base_service.h>
+#include <services/serviceman.h>
+
+namespace skyline::service::am {
+    /**
+     * @brief IApplicationProxyService is used to open an application proxy (https://switchbrew.org/wiki/Applet_Manager_services#appletOE)
+     */
+    class IApplicationProxyService : public BaseService {
+      public:
+        IApplicationProxyService(const DeviceState &state, ServiceManager &manager);
+
+        /**
+         * @brief This returns #IApplicationProxy (https://switchbrew.org/wiki/Applet_Manager_services#OpenApplicationProxy)
+         */
+        void OpenApplicationProxy(type::KSession &session, ipc::IpcRequest &request, ipc::IpcResponse &response);
+    };
+}