[reefd] HTTP server to handle launching instances with goroutine

[khluu]

• HTTP server to handle POST requests with instance configuration to launch
• Handler function to add the configuration as the desired state in the launch_requests sqlite table then kick off a goroutine to execute processLaunchRequests function.
• The processLaunchRequests function does the following:
  • Pull instance info from AWS and update current state of all instances in launch_requests table
  • Query for requests that don't have an associated instance (which means instance was not launched to satisfy the desired state yet)
  • Calls another function to launch instance to match the desired state for each matching request
  • Update the launched instance ID to the respective request row in the table.