Bug
1838074 - Add mach commands for interop scoring CI runs, r=Sasha,ahal
This adds two new mach commands:
`mach wpt-fetch-logs` which can download log files from mozilla CI or
taskcluster runs on GitHub.
`mach wpt-interop-score` which can download runs and compute the
interop score. By default this filters tasks to those most like
upstream CI i.e. linux64 opt builds.
The actual implementation is mostly in external packages; the mach
commands are mostly frontends to these.
Differential Revision: https://phabricator.services.mozilla.com/
D180731