feat(model): add model for ColumnView

Added model that are GObject for generating values in tables.

src/model/mod.rs

@@ -1,2 +1,15 @@
 pub mod builder_traits;
 pub mod models;
+
+use crate::gtk::glib;
+use glib::Object;
+
+glib::wrapper! {
+    pub struct ResultValue(ObjectSubclass<models::ResultValue>);
+}
+
+impl ResultValue {
+    pub fn new(val: f64) -> Self {
+        Object::builder().property("value", val).build()
+    }
+}