pycardium/utime: add set_time_ms and set_unix_time_ms

This merge request adds millisecond variants of the set_time functions.

This can be useful in case one wants to change the time without desyncing the milliseconds by accidently resetting them to 0.

Added functions:

• utime.set_time_ms(ms)
• utime.set_unix_time_ms(ms)

pycardium/modules/qstrdefs.h

@@ -50,7 +50,9 @@ Q(mktime)
 Q(time)
 Q(time_ms)
 Q(set_time)
+Q(set_time_ms)
 Q(set_unix_time)
+Q(set_unix_time_ms)
 
 /* vibra */
 Q(vibra)