remove pterm dependency, replace with printing to stdout

[tobert]

The server tui functionality doesn't seem too widely used and its usefulness is limited. The pterm module has frequent updates and pulls in a few dependencies that could be left behind.

My thought is to rip pterm out and have otel-cli server tui instead print spans to the terminal, with more detail than the current text UI can show.

The result should work in more terminals, with less fuss, while showing more details.