Added Support for ElastiCache Reserved Cache Nodes

[mousavian]

Description

Added support for purchasing ElastiCache reserved Cache Nodes via Terraform.

Relations

Closes #28060

References

• aws . elasticache . describe-reserved-cache-nodes-offerings
• aws . elasticache . purchase-reserved-cache-nodes-offering
• Go API Reference

Output from Acceptance Testing

⚠️ Since reservations can't be deleted without getting help from AWS Support, Unfortunately I am not able to run this test. Unless you don't have the budget allocated for this kind of stuff, we probably should just rely on the community to test — similar to #26025 (comment).
The reservation test will be skipped if RUN_ELASTICACHE_RESERVED_CACHE_NODE_TESTS env variable is not provided to prevent any unwanted cost.

$ make testacc TESTS=TestAccElastiCacheReservedNodeOffering_\|TestAccElastiCacheReservedCacheNode_ PKG=elasticache

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/elasticache/... -v -count 1 -parallel 20 -run='TestAccElastiCacheReservedNodeOffering_|TestAccElastiCacheReservedCacheNode_'  -timeout 180m
=== RUN   TestAccElastiCacheReservedNodeOffering_basic
=== PAUSE TestAccElastiCacheReservedNodeOffering_basic
=== RUN   TestAccElastiCacheReservedCacheNode_basic
    reserved_cache_node_test.go:24: Environment variable RUN_ELASTICACHE_RESERVED_CACHE_NODE_TESTS is not set to true
--- SKIP: TestAccElastiCacheReservedCacheNode_basic (0.00s)
=== CONT  TestAccElastiCacheReservedNodeOffering_basic
--- PASS: TestAccElastiCacheReservedNodeOffering_basic (22.10s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/elasticache	26.258s

[github-actions]

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[mousavian]

Hey @justinretzolk ,
The issue #28060 related to this PR has 50+ thumbs-ups. Does this qualify this PR to be prioritised and reviewed?

Thanks,
R

[sedatsencan]

Any update?

[gdavison]

Thanks for the PR, @mousavian. I've converted the implementations from Terraform Plugin SDK to Framework and made a few adjustments

--- PASS: TestAccElastiCacheReservedNodeOffering_basic (11.19s)

[github-actions]

This functionality has been released in v5.68.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!