Update: Go Worker Auto Scaling wiki

[Bueller87]

Issues:

• There is a new Go sample that demonstrates this feature on a localhost env.
• Can we better demonstrate what happens in a real world scenario?
• What happens when autoscaling is configured for the workers?

Solution:

• A link to and a description of the new Go sample inserted in the "How to get started" section.
• Added Grafana panels to the two "Scenario" sections to visually show the effects of enabling autoscaling in a previously poorly configured cluster.

Caveats:

• We should add the minimum required version of Cadence and the Go Client.
• Will wait for the new sample to be merged before publishing these updates.