Remove sqlite-viewer and using database client (#31223)

sqlite-viewer can not edit sqlite.
database client can connect to almost all common databases, which is
very useful I think. Of cause, it can edit sqlite.

https://marketplace.visualstudio.com/items?itemName=cweijan.vscode-database-client2

And for using sqlite, sqlite3 is required. So also added a new feature:
https://github.com/warrenbuckley/codespace-features
found from: https://containers.dev/features

.gitpod.yml

@@ -43,7 +43,7 @@ vscode:
     - Vue.volar
     - ms-azuretools.vscode-docker
     - vitest.explorer
-    - qwtel.sqlite-viewer
+    - cweijan.vscode-database-client2
     - GitHub.vscode-pull-request-github
 
 ports: