Add DevContainer, VSCode config and extensions.json

(cherry picked from commit 5061dc4b5e5ea9925740496a5939a1762788b793)

Closes #9914

.vscode/launch.json

@@ -0,0 +1,26 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      // Use IntelliSense to find out which attributes exist for C# debugging
+      // Use hover for the description of the existing attributes
+      // For further information visit https://github.com/dotnet/vscode-csharp/blob/main/debugger-launchjson.md
+      "name": "Run Radarr",
+      "type": "coreclr",
+      "request": "launch",
+      "preLaunchTask": "build dotnet",
+      // If you have changed target frameworks, make sure to update the program path.
+      "program": "${workspaceFolder}/_output/net6.0/Radarr",
+      "args": [],
+      "cwd": "${workspaceFolder}",
+      // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
+      "console": "integratedTerminal",
+      "stopAtEntry": false
+    },
+    {
+      "name": ".NET Core Attach",
+      "type": "coreclr",
+      "request": "attach"
+    }
+  ]
+}