feat: Add kms_key_identifier arg for aws_pipes_pipe

[acwwat]

Description

This PR is to add the kms_key_identifier argument to the aws_pipes_pipe resource.

Relations

Closes #39288

References

Referred to CreatePipe for specs and wordings.

Output from Acceptance Testing

$ make testacc "TESTS=TestAccPipesPipe_basicSQS|TestAccPipesPipe_kmsKeyIdentifier" PKG=pipes
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.3 test ./internal/service/pipes/... -v -count 1 -parallel 20 -run='TestAccPipesPipe_basicSQS|TestAccPipesPipe_kmsKeyIdentifier'  -timeout 360m -vet=off
2025/01/25 23:29:01 Initializing Terraform AWS Provider...
=== RUN   TestAccPipesPipe_basicSQS
=== PAUSE TestAccPipesPipe_basicSQS
=== RUN   TestAccPipesPipe_kmsKeyIdentifier
=== PAUSE TestAccPipesPipe_kmsKeyIdentifier
=== CONT  TestAccPipesPipe_basicSQS
=== CONT  TestAccPipesPipe_kmsKeyIdentifier
--- PASS: TestAccPipesPipe_basicSQS (79.31s)
--- PASS: TestAccPipesPipe_kmsKeyIdentifier (140.03s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/pipes      140.276s

$

[github-actions]

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