refactor: rename aim to upm and extract appimage module

crates/upm-core/src/app/interaction.rs

@@ -0,0 +1,20 @@
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct InteractionRequest {
+    pub key: String,
+    pub kind: InteractionKind,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum InteractionKind {
+    SelectRegisteredApp {
+        query: String,
+        matches: Vec<String>,
+    },
+    ChooseTrackingPreference {
+        requested_version: String,
+        latest_version: String,
+    },
+    SelectArtifact {
+        candidates: Vec<String>,
+    },
+}