Save results to file

[davidgantman]

Is your feature request related to a problem? Please describe.
Currently, results are just printed to stdout, and to patchwise.log. Finding the results for a specific commit & for a specific review can be tedious.

Describe the solution you'd like
Save the results for each patch review for each commit to a unique file. Example:
/tmp/patchwise/output/sha123/coccicheck.txt
/tmp/patchwise/output/sha123/sparse.txt
/tmp/patchwise/output/sha123/aicodereview.txt