Is your enhancement request related to a problem? Please describe.
Currently, NGF only supports HTTPRoute and TLSRoute, lacking support for TCPRoute and UDPRoute. This makes it impossible to manage Layer 4 (TCP/UDP) traffic through Gateway API.

What would you like to be added:
Add basic support for TCPRoute and UDPRoute in NGF, including:

1. Implement controllers for TCPRoute and UDPRoute to watch and process these resources.
2. Support associating a single backend Service in the route rules.
3. Generate corresponding NGINX stream configurations to enable Layer 4 load balancing (e.g., distributing TCP traffic to multiple pods behind a Service).

Why this is needed:
Many users need to manage TCP-based services (e.g., databases, message queues) alongside HTTP services.

Additional context
Add any other context or screenshots about the enhancement request here.