[Enhancement]: AuthenticationMode for ElastiCache User

[darkwizard242]

Description

AWS ElastiCache now provides the capability for IAM based authentication. An ElastiCache user can be created with AuthenticationMode type set to iam.

This may require a new attribute (something like authentication_mode in the aws_elasticache_user resource).

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

aws_elasticache_user

Potential Terraform Configuration

resource "aws_elasticache_user" "test" {
  user_id             = "testUserId"
  user_name           = "testUserName"
  access_string       = "on ~app::* -@all +@read +@hash +@bitmap +@geo -setbit -bitfield -hset -hsetnx -hmset -hincrby -hincrbyfloat -hdel -bitop -geoadd -georadius -georadiusbymember"
  authentication_mode = "iam"
  engine              = "REDIS"
  passwords           = ["password123456789"]
}

References

Announcement:
https://aws.amazon.com/about-aws/whats-new/2022/11/amazon-elasticache-supports-iam-authentication-redis-clusters/

Docs:
https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/auth-iam.html
https://aws.amazon.com/blogs/database/simplify-managing-access-to-amazon-elasticache-for-redis-clusters-with-iam/

API reference:
https://docs.aws.amazon.com/AmazonElastiCache/latest/APIReference/API_CreateUser.html
https://docs.aws.amazon.com/AmazonElastiCache/latest/APIReference/API_AuthenticationMode.html

Would you like to implement a fix?

No

[github-actions]

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[Wobbley]

Related to: #28471 ?

[github-actions]

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