Refresh example code

[BrianMMcClain]

• Update provider versions
• Update module versions
• Update cluster version
• Update addon version
• Use cluster_addons parameter of the EKS module rather than separate resource
• enable_cluster_creator_admin_permissions = true

Closes #42 Closes #43 Fixes #96

[tshaiman]

• use version 20.8.5
• bump csi add on to v1.29.0-eksbuild.1
• Consider using Access Entries and/or make the caller as admin on the AKS Cluster ( previous example did not do that and the caller was not able to access the cluster API) , I guess

  enable_cluster_creator_admin_permissions = true 

  solves this .