Improve support of Amazon EKS production grade deployments

[sdpoueme]

Is your feature request related to a problem? Please describe.
Many customers looking to run Agones game servers are facing challenges with setting up and managing these components on Amazon EKS. This is becoming a common requirement for building end-to-end game server hosting solutions that can integrate with the AWS ecosystem.

Describe the solution you'd like
We propose the following feature addition to the Agones project:

1. Improved support for Amazon EKS multi-cluster and multi-region game server deployments, including enhancements to ingress mechanisms, allocation and load balancing of game sessions across geographically distributed Agones clusters on AWS.
2. Terraform-based Infrastructure as Code (IaC) to simplify the deployment and management of Agones-based game server fleets on Amazon EKS.

Describe alternatives you've considered
Manuel setup and configurations. But this is very tedious. Using Helm works, but requires customization and a certain level of knowledge regarding potential parameters to setup.

Additional context
The approach we propose is an approach based on AWS best practices and a fully vetted solutions architecture guidance.