feat(binding-websockets): implement WebSocket client with W3C WoT protocol support

Implements complete WebSocket client binding with support for:
- OAuth2 Bearer token authentication via custom headers
- WebSocket subprotocol negotiation from Thing Description forms
- Configurable protocol mode: W3C Web Thing Protocol or generic WebSocket
- All CRUD operations: readResource, writeResource, invokeResource
- Full subscription support: subscribeResource and unlinkResource
- Proper field naming per W3C spec: input/output for actions, value for properties
- Connection management with one persistent connection per Thing
- Request/response correlation using message IDs
- Timeout handling and error propagation
- Multiple subscription handlers per resource

This resolves the incomplete stub implementation in ws-client.ts and enables
real-world usage of WebSocket bindings with authenticated Things using either
W3C Web Thing Protocol or generic WebSocket communication.

Signed-off-by: Josh Thomas <>
Signed-off-by: Josh Thomas <jthomas@ignite-retail.com>

Author: Josh Thomas