Add Fleeting to the draft Taskscaler implementation

• Add Fleeting to the Taskscaler implementation.

What is Fleeting?

• Fleeting provisions a virtual machine.

What is Taskscaler

• Taskscaler automatically provisions fleets of virtual machines on cloud providers via Fleeting and allocating and assigning tasks to run on the virtual machines.
• The virtual machines created by Taskscaler are used by GitLab Runner to execute GitLab CI jobs using the GitLab Runner Docker Executor
• To use Taskscaler requires (1) credentials for the target cloud platform and (2) the name of the autoscaling group.