Allow setting `network_type` argument

[z0rc]

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Describe the Feature

Allow setting network_type argument in aws_elasticache_cluster managed by module.

Expected Behavior

Add module variable to set https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/elasticache_cluster.html#network_type

Use Case

I need to create memcached cluster with network_type = "dual_stack" in dualstack subnet.

Describe Ideal Solution

See 'Expected Behaviour'

Alternatives Considered

Drop this module, manage aws_elasticache_cluster on my own.

Additional Context

None.