Allow logging to terminal when progress bars are enabled

[arya2]

Motivation

Zebra's terminal output is weird when progress bars are enabled without logging to a file.

It would be nice for users to be able to see warning logs adjacent to the progress bars.

Possible Designs

One of:

• Pass the non-blocking logger a struct that implements Writer with howudoin::Tx::{add_warn, add_info, ..}
• Call tracing::{info, warn, trace, debug} through functions defined in Zebra that call howudoin's log methods instead of the tracing methods when progress bars are enabled and writing logs to the terminal
• Use indicatif directly instead of howudoin and implement Writer to write to stdout from suspend()
• Add suspend() to howudoin and implement Writer to write to stdout from suspend()

[teor2345]

This is currently handled by always sending logs to a file when progress bars are configured.

Showing both logs and progress bars at the same time is something to consider after we implement separate summary and detailed modes.