gdk measure - Local Sitespeed reports

What does this Merge Request do?

It adds a new gdk command to make it easier to run specific performance tests based on sitespeed and our setup + configuration. It is using Docker locally and is checking if it is installed and if you query the local GDK will also do a check if its up and running.

For example:

gdk measure /explore

gdk measure http://127.0.0.1/explore https://gitlab.com/explore

When test report is created it will open it right away in the browser. The corresponding GitLab MR for enabling calls from Docker was merged yesterday.

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.

Closes #1032 (closed)