Add gp3 support to RDS

[bschaatsbergen]

Description

Relations

Closes #27702

References

Output from Acceptance Testing

$ make testacc TESTS=TestAccRDSInstance_basic PKG=rds
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/rds/... -v -count 1 -parallel 20 -run='TestAccRDSInstance_basic'  -timeout 180m
=== RUN   TestAccRDSInstance_basic
=== PAUSE TestAccRDSInstance_basic
=== CONT  TestAccRDSInstance_basic
--- PASS: TestAccRDSInstance_basic (507.48s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/rds        509.327s

[github-actions]

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[justinretzolk]

Hey @bschaatsbergen 👋 Looks like this is a duplicate of #27670.

[bschaatsbergen]

Good spot @justinretzolk, closing mine.

[github-actions]

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