chore(config): add Vitest configuration file

- Added vitest.config.ts:
  - Configured Vitest settings with global variables and Node environment
  - Included specific test files (`kata*/**/*.Test.*`)
  - Excluded non-TypeScript test files (`**/node_modules/**`, `kata*/**/*.Test.coffee`, `kata*/**/*.Test.swift`, `kata*/**/*.Test.csharp`)
  - Set up coverage reporters for text, JSON, and HTML

Introduced a new Vitest configuration file to define testing and coverage settings, ensuring compatibility with the project's testing structure and excluding non-relevant test files.

Author: tsdevau

vitest.config.ts

@@ -0,0 +1,19 @@
+/// <reference types="vitest/config" />
+import { defineConfig } from "vitest/config"
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["kata*/**/*.Test.*"],
+    exclude: [
+      "**/node_modules/**",
+      "kata*/**/*.Test.coffee",
+      "kata*/**/*.Test.swift",
+      "kata*/**/*.Test.csharp",
+    ],
+    coverage: {
+      reporter: ["text", "json", "html"],
+    },
+  },
+})