feat: Add support for availability zone rebalancing (terraform-aws-mo…

[sebastianarca]

Description

This PR aims to add support for availability zone rebalancing in the services.
(This PR is a rework of the following pull request : #269)

I wish if it is possible to incorporate it as a minor version instead of incorporating it as a major version.

Motivation and Context

Fixes : #262

Breaking Changes

How Has This Been Tested?

• I have updated at least one of the examples/* to demonstrate and validate my change(s)
• I have tested and validated these changes using one or more of the provided examples/* projects

• I have executed pre-commit run -a on my pull request

---

Example of the terraform plan in module example.

# module.ecs.module.service["ecsdemo-frontend"].aws_ecs_service.this[0] will be created
  + resource "aws_ecs_service" "this" {
      + availability_zone_rebalancing      = "ENABLED"
      + cluster                            = (known after apply)
      + deployment_maximum_percent         = 200
      + deployment_minimum_healthy_percent = 66
      + desired_count                      = 1
      + enable_ecs_managed_tags            = true
      + enable_execute_command             = false
      + force_new_deployment               = true
      + iam_role                           = (known after apply)
      + id                                 = (known after apply)
      + launch_type                        = "FARGATE"
      + name                               = "ecsdemo-frontend"
      + platform_version                   = (known after apply)
      + scheduling_strategy                = "REPLICA"
      + tags                               = {
          + "Example"    = "ex-complete"
          + "Name"       = "ex-complete"
          + "Repository" = "https://github.com/terraform-aws-modules/terraform-aws-ecs"
        }
      + tags_all                           = {
          + "Example"    = "ex-complete"
          + "Name"       = "ex-complete"
          + "Repository" = "https://github.com/terraform-aws-modules/terraform-aws-ecs"
        }
      + task_definition                    = (known after apply)
      + triggers                           = (known after apply)
      + wait_for_steady_state              = false

      + load_balancer {
          + container_name   = "ecsdemo-frontend"
          + container_port   = 3000
          + target_group_arn = (known after apply)
            # (1 unchanged attribute hidden)
        }

      + network_configuration {
          + assign_public_ip = false
          + security_groups  = (known after apply)
          + subnets          = (known after apply)
        }

      + service_connect_configuration {
          + enabled   = true
          + namespace = (known after apply)

          + service {
              + discovery_name = "ecsdemo-frontend"
              + port_name      = "ecsdemo-frontend"

              + client_alias {
                  + dns_name = "ecsdemo-frontend"
                  + port     = 3000
                }
            }
        }

      + timeouts {}
    }

[bryantbiggs]

this must be implemented within/after the breaking change because it requires v5.77 of the AWS provider (current module is on 4.x)