libsysprof-gtk: add session model/item

This makes it easy to get a session instance from inside a .ui file for
binding into listview rows.

src/libsysprof-gtk/sysprof-session-model.h

@@ -0,0 +1,48 @@
+/* sysprof-session-model.h
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <sysprof-analyze.h>
+
+#include "sysprof-session.h"
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_SESSION_MODEL (sysprof_session_model_get_type())
+
+SYSPROF_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (SysprofSessionModel, sysprof_session_model, SYSPROF, SESSION_MODEL, GObject)
+
+SYSPROF_AVAILABLE_IN_ALL
+SysprofSessionModel *sysprof_session_model_new         (SysprofSession      *session,
+                                                        GListModel          *model);
+SYSPROF_AVAILABLE_IN_ALL
+GListModel          *sysprof_session_model_get_model   (SysprofSessionModel *self);
+SYSPROF_AVAILABLE_IN_ALL
+void                 sysprof_session_model_set_model   (SysprofSessionModel *self,
+                                                        GListModel          *model);
+SYSPROF_AVAILABLE_IN_ALL
+SysprofSession      *sysprof_session_model_get_session (SysprofSessionModel *self);
+SYSPROF_AVAILABLE_IN_ALL
+void                 sysprof_session_model_set_session (SysprofSessionModel *self,
+                                                        SysprofSession      *session);
+
+G_END_DECLS