make EVS stdout timestamps configurable

[CDKnightNASA]

Is your feature request related to a problem? Please describe.
Currently the EVS output includes a full timestamp of YYYY-DDD HH:MM:SS.XXXXX which, for most users, is too much information (how likely are you going to run cFS for years?) and creates a lot of noise in the output. Instead, EVS should be configurable (compile-time, load-time, or run-time) to control what output timestamp format it should use.

Describe the solution you'd like
A runtime-reconfigurable timestamp, at minimum the format string to use for strftime, plus "%f" (not part of the C standard, but adopted from the Python strftime API) for the microseconds. Additionally, instead of "clock time", have an option to switch to "seconds since start" and/or "seconds since timer reset" with an associated reset command.

Describe alternatives you've considered
Leaving well enough alone.

Additional context
See also #2295

Requester Info
Christopher.D.Knight@nasa.gov