Fix: rospy logger format %f microseconds

[rafa-martin]

With the following ROSCONSOLE_FORMAT=[${severity}] [${time:%Y-%m-%d %H:%M:%S.%f}] ... the console output from rospy info function:

[INFO] [2024-01-16 23:46:27.%f] ...

The problem here is, date class does't use "%f" to match microseconds link.

This issue can be addressed to way:

1. Calculate microseconds and replace each "%f" with calculated
2. Change time class to datetime class

This PR uses first aproach. Now output of python node is:

[INFO] [2024-01-16 23:46:27.920983] ...

Aditional info:

• https://stackoverflow.com/questions/7479777/difference-between-python-datetime-vs-time-modules
• https://stackoverflow.com/questions/7588511/format-a-datetime-into-a-string-with-milliseconds
• https://docs.python.org/3/library/time.html

[peci1]

I've implemented option 2 in https://github.com/ros/ros_comm/pull/2370 .