Print colored exception tracebacks in interactive terminals

[bobokvsky]

Summary

• Enable ANSI-colored traceback-with-variables output when datapipe logs pipeline exceptions in an interactive terminal.
• Split error logging into a short logger.error header and a separate traceback body written directly to stderr, so escape codes are not lost inside the logging formatter.
• Keep plain-text behavior in non-TTY environments (CI, redirected logs): when supports_ansi(sys.stderr) is false, the traceback is still logged via logger.error as before.

Also:

• Route datapipe CLI logging through RichHandler when stderr supports ANSI.
• Pipeline step logs (datapipe.compute, datapipe.step.*) are colored in the terminal.
• Plain-text logging is preserved for CI and non-TTY output.

[elephantum]

@bobokvsky тут случились конфликты