Adding a log file to workload output

[coleramos425]

When rocprofiler errors inevitably come up it's almost always required users re-profile their applications to share terminal output. It would be useful to pipe this output to a common "log file".

As suggested by @feizheng10 it would be very useful to add a log to each workload directory. Other things to store might be:

• Missing/skipped counters
• Detecting if a processes didn't launch any kernels (CC: @arghdos) (Improve documentation for usage with multi-process runs #7 (comment))

What other warnings would users like to see called out in such a file?