resource/aws_elasticache_replication_group: Add attribute node_groups

[gdavison]

Description

Add an attribute node_groups that will output the shards (node groups) in the replication group.

Affected Resource(s) and/or Data Source(s)

aws_elasticache_replication_group

Potential Terraform Configuration

No response

References

Should be similar to global_node_groups in #27500

Would you like to implement a fix?

No response

[github-actions]

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[github-actions]

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