Add lua support through local-lua-debugger-vscode

Add the lua adapter to gadgets.py and installer.py, update the README.md
file and create basic tests using lua, luajit and love.

support/test/lua/simple/.vimspector.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "https://puremourning.github.io/vimspector/schema/vimspector.schema.json#",
+  "configurations": {
+    "lua": {
+      "adapter": "lua-local",
+      "configuration": {
+        "request": "launch",
+        "type": "lua-local",
+        "cwd": "${workspaceFolder}",
+        "program": {
+          "lua": "lua",
+          "file": "simple.lua"
+        }
+      }
+    },
+    "luajit": {
+      "adapter": "lua-local",
+      "configuration": {
+        "request": "launch",
+        "type": "lua-local",
+        "cwd": "${workspaceFolder}",
+        "program": {
+          "lua": "luajit",
+          "file": "simple.lua"
+        }
+      }
+    }
+  }
+}