adding pipe feature in cli

[Amos-Rai-KEYS]

Summary

• Allow infragraph translate <tool> | infragraph visualize --output OUT_DIR to work directly: translate writes its YAML/JSON to stdout instead of a file when --output is omitted and its stdout is an actual OS pipe, and visualize reads the infrastructure definition from stdin when --input is omitted and its stdin is an actual OS pipe.
• Detection uses stat.S_ISFIFO on the fd (not just isatty()), so it only kicks in for a real shell | pipe — standalone runs and >-redirected output keep writing/reading files exactly as before.
• Moved translate's status/log lines (e.g. translated output file ..., Annotated infragraph ... written to ...) from stdout to stderr so they never get mixed into piped or redirected data.

Test plan

• infragraph translate lstopo --input <xml> still writes device.yaml with the status line printed (existing behavior unchanged).
• infragraph translate lstopo --input <xml> > out.yaml still writes device.yaml (not out.yaml, which now stays empty since status moved to stderr) — confirms > redirection isn't mistaken for a pipe.
• infragraph translate lstopo --input <xml> | infragraph visualize --output viz_out produces a working viz_out/index.html.
• infragraph visualize --output viz_out with no --input and no piped stdin fails with a clear Invalid value for --input error instead of hanging or crashing.
• infragraph visualize --input device.yaml --output viz_out (explicit file) still works unchanged.