libfeedback: Make libfeedback.h only include other files

Move the init functions to their own header so we don't clutter
libfeedback.h more in the future.

Signed-off-by: Guido Günther <agx@sigxcpu.org>

libfeedback/lfb-main.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2025 The Phosh Developers
+ *
+ * SPDX-License-Identifier: LGPL-2.1+
+ */
+#pragma once
+
+#include "lfb-gdbus.h"
+
+#include <glib.h>
+
+#if !defined (__LIBFEEDBACK_H_INSIDE__) && !defined (LIBFEEDBACK_COMPILATION)
+#error "Only <libfeedback.h> can be included directly."
+#endif
+
+G_BEGIN_DECLS
+
+gboolean    lfb_init (const gchar *app_id, GError **error);
+void        lfb_uninit (void);
+void        lfb_set_app_id (const char *app_id);
+const char *lfb_get_app_id (void);
+gboolean    lfb_is_initted (void);
+void        lfb_set_feedback_profile (const char *profile);
+const char *lfb_get_feedback_profile (void);
+LfbGdbusFeedback *lfb_get_proxy (void);
+
+G_END_DECLS