feat(api): add ResolveSpec and WebSocket client implementations

- Introduced ResolveSpecClient for REST API interactions.
- Added WebSocketClient for real-time communication.
- Created types and utility functions for both clients.
- Removed deprecated types and example files.
- Configured TypeScript and Vite for building the library.

resolvespec-js/src/headerspec/index.ts

@@ -0,0 +1,7 @@
+export {
+    HeaderSpecClient,
+    getHeaderSpecClient,
+    buildHeaders,
+    encodeHeaderValue,
+    decodeHeaderValue,
+} from './client';