Change hepc-init to Python and add debugging configuration

This heavily uses plumbum to retain a shell-script style but add data
structures that will be needed

client/qldbtools/.vscode/launch.json

@@ -0,0 +1,24 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        
+           {
+            "name": "Python Debugger: Current File with Arguments",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${file}",
+            "console": "integratedTerminal",
+            "args": [
+                "--db_collection_dir",
+                "db-collection-py",
+                "--starting_path",
+                "$HOME/work-gh/mrva/mrva-open-source-download"
+            ],
+            "justMyCode": true,
+            "stopOnEntry": false
+        }
+    ]
+}