Fully Expand Elasticache Cluster and Replication Group Resource Schemas

[bflad]

Currently the aws_elasticache_cluster and aws_elasticache_replication_group resource schemas are generated by functions:

https://github.com/terraform-providers/terraform-provider-aws/blob/7a46d54b4fe593735db4daa118fe30353a0cdd62/aws/resource_aws_elasticache_cluster.go#L21-L243

https://github.com/terraform-providers/terraform-provider-aws/blob/7a46d54b4fe593735db4daa118fe30353a0cdd62/aws/resource_aws_elasticache_replication_group.go#L16-L132

The result is a complicated structure to create a working mental model of what the schema actually is for each attribute, especially when there are bits like this mixed in:

resourceSchema["engine"].Computed = true

Let's just expand each of the resource schemas so no mental gymnastics are required. Tangentially this would also help make the schema more lint-able without runtime handling.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!