improved extension_installer.py and renamed it to extension_manager.py

.vscode/settings.json

@@ -49,6 +49,7 @@
     "davidanson",
     "dbus",
     "dearrow",
+    "debugpy",
     "devicemap",
     "dialout",
     "direnv",
@@ -127,6 +128,7 @@
     "mousewheel",
     "mpris",
     "msbc",
+    "mtxr",
     "ncdu",
     "nemo",
     "neofetch",
@@ -210,6 +212,7 @@
     "sonarr",
     "sponsorblock",
     "spotifyd",
+    "sqltools",
     "sshconfig",
     "subresource",
     "substituters",