feat: Enhance HaloClient with retry logic and improve error handling

- Added retry options to HaloClient for handling transient errors.
- Refactored request methods in HaloClient to utilize retry logic.
- Updated HaloService to include logging for error handling.
- Introduced ApiPaths utility for managing API endpoints.
- Implemented logger utility for consistent logging across services.
- Added tests for ContentService, Error handling, and TaxonomyService.
- Created retry utility for managing retry logic with exponential backoff.
- Updated types to include additional properties for better API response handling.

obsidian-halo/vitest.config.ts

@@ -0,0 +1,13 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'node',
+    include: ['src/**/*.test.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+    },
+  },
+});