Feature request: lint files in parallel

[michaeleiselsc]

Issue Summary

Linting seems ripe for parallelization, but unfortunately I haven't seem a good solution yet. I've tried running this script, https://gist.github.com/tommeier/ff660205271f82a47041, but as you can see with the timings I posted in there, it doesn't parallelize very well. My other solution is to put subsets of the overall compile_commands.json into individual temp directories (while needing to keep the whole in the base dir of the project) and then starting a thread running oclint-json-compilation-database from each directory. With the latter method, I get good parallelization with about 4x speedup

[ryuichi-assistant]

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[AbigailBuccaneer]

run-clang-tidy.py provides a good model for how to do this.

[ryuichis]

Looks nice. @AbigailBuccaneer could you help incorporate something similar to oclint-json-compilation-database?

[vaibhav-shah]

+1; this would be great to have. However, how would the issue of multiple reports be tackled?