FR: Bypass exit nodes for certain domains

### What are you trying to do?

When using an exit node I would like to route all traffic from specific applications through tailscale while allowing other applications direct access.

### How should we solve this?

Normally this is done when turning on an exit node, you would set a whitelist for applications that would use said exit node.

### What is the impact of not solving this?

Currently you would have to use the exit node globally in Tailscale which is not ideal for:

- Bandwidth sensitive applications
- Latency sensitive applications

Or use VPN service that supports split tunneling instead.

### Anything else?

_No response_