Mutagen sync for macOS with Docker for Mac

[FatherShawn]

Implement https://mutagen.io/documentation/orchestration/compose and release once mutagen v0.12 is out of beta.

Refs:

• https://gist.github.com/chriswales95/8f3536dca8e49492a75bca50bc73602d
• https://github.com/docker/for-mac/issues/1592#issuecomment-689486965

[FatherShawn]

Testing: ahoy drush si standard --account-name=Primaryuser --account-pass=1234 -y

Current(docker machine)		DFM with mutagen		DFM with NFS
60		71		82
61		82		77
59		72		76
Median	60		72		77
Average	60		75		78
Comparison by Median			120%		128%

We will continue to monitor performance but docker-machine is still the fastest.