chore(workflows): add CI workflows and configuration files

- Add default merge message template for PRs
- Introduce workflow for major version tag creation on release
- Add workflow for auto changelog and release generation
- Add git-cliff configuration for changelog formatting
- Configure `.vscode` workspace settings and `.gitignore` updates

.vscode/settings.json

@@ -0,0 +1,11 @@
+{
+    "workbench.colorCustomizations": {
+        "activityBar.activeBackground": "#528859",
+        "activityBar.background": "#528859",
+        "activityBar.foreground": "#e7e7e7",
+        "activityBar.inactiveForeground": "#e7e7e799",
+        "activityBarBadge.background": "#c6c3db",
+        "activityBarBadge.foreground": "#15202b"
+    },
+    "peacock.color": "#3f6844"
+}