Add tbhandler to pdnsutil akin to pdns_server

[jsoref]

• Program: pdnsutil
• Issue type: Feature request

Short description

When pdnsutil crashes, as in #10885 it doesn't provide a stack trace

Usecase

It's a lot easier to fix bugs if a stack trace is automatically provided

Description

[Habbie]

Recursor and dnsdist might also like this.

[rgacogne]

That looks like a good idea, although I would prefer if it was off by default in dnsdist.