Summary:
script parses and matches the license-checker output to the set format for
the markdown renderer (coming in a follow up diff).

Test Plan: tested on repo, seems to work.

Reviewers: michelle, zasgar, #engineering

Reviewed By: zasgar, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D2218

GitOrigin-RevId: 4ed8fc54513ee88ba55e54391b9285225f151c99