Parsing statistics

This folder is independent from the rest of the semgrep project. It only has semgrep-core as a dependency, and the CI setup in .circleci and/or .github. We could move it to another repo if desired.

To test the parsing stats:

$ make test

To run the stats on all the languages in parallel:

$ make  # or ./run-all

To run the stats for just one language:

$ ./run-lang java  # or whatever language you want