Default logging format design

[SteveMacenski]

Was there a design discussion around the default logging format defined here?

rcutils/src/logging.c

Line 65 in ff8ca58

static const char * g_rcutils_logging_default_output_format = "[{severity}] [{name}]: {message}";

I'd think the default you'd want a unix timestamp to determine relative timing of when events or logs occur. I can submit a PR to change this is folks agree. I can say from experience working with Navigation2 that this has been a pain point, which I know can be worked around setting RCUTILS_CONSOLE_OUTPUT_FORMAT however I'd think a timestamp is a reasonable default behavior.

[fujitatomoya]

@SteveMacenski

i totally do agree with you.

[SteveMacenski]

#190