Add option to disconnect current connection and keep the tab open when using telnet, serial or ssh

[kenifanying]

Is your feature request related to a problem? Please describe.
It's really annoying that tabby can only disconnect current connection by close tab.

Describe the solution you'd like
Add option to disconnect current connection and keep the tab open when using telnet, serial or ssh.

Describe alternatives you've considered
NA

Additional context
This is the similar option in securecrt.

[xiaolitongxue666]

It's a good advice

[Issues-translate-bot]

The translator bot has detected that this issue body's language is not English, and has translated it automatically.

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It's a good advice

[hypomaniak]

Update for this post...

I think this would be really useful in my case, since I'd like to close the serial connection to run a custom command line tool on the current serial port and then reopen the port, without having to close the tab.

[Clem-Fern]

Hi, i'm currently working on this. I will open a PR in a few days to address this issue :)