Offer high performance for an "Enterprise tier"

[arhamahmed]

A high performance tier for customers willing to pay more. This could be offered as a service, as well. Possible areas for improvements are the following:

• Cloud Spanner in place of Cloud SQL

• More powerful database machine type

• More powerful instance machine type

• Larger base amount of instances / nodes (GAE / GKE)

• Heavy gem caching

• Gem sharding

• Cloud CDN auto configuration