FR: Add Tailscale IPs to Windows local intranet

### What are you trying to do?

I [map a network drive](https://support.microsoft.com/en-us/windows/file-sharing-over-a-network-in-windows-b58704b2-f53a-4b82-7bc1-80f9994725bf) to a Windows drive letter with its Tailscale IP address. However, Windows complains anytime files are copied from this samba share to my local computer:

### How should we solve this?

It would be great if Tailscale could automatically tell Windows that these IPs are on an intranet.

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

To work around this at present, I followed the instructions at https://superuser.com/questions/149056/disable-these-files-might-be-harmful-to-your-computer-warning. I have to repeat this on each new Windows machine where I map the Samba share.

Solving this feature request would reduce setup effort for each new machine.

### Anything else?

I know Taildrive is under beta; perhaps that may be another solution for my specific scenario?