r/appconfig_deployment: add kms_key_identifier attribute

[johnsonaj]

Description

Relations

Closes #34701
Closes #31999

References

Output from Acceptance Testing

% make testacc TESTARGS="-run=TestAccAppConfigDeployment_kms" PKG=appconfig

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/appconfig/... -v -count 1 -parallel 20  -run=TestAccAppConfigDeployment_kms -timeout 360m
=== RUN   TestAccAppConfigDeployment_kms
=== PAUSE TestAccAppConfigDeployment_kms
=== CONT  TestAccAppConfigDeployment_kms
--- PASS: TestAccAppConfigDeployment_kms (124.36s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/appconfig	127.583s

[github-actions]

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[github-actions]

This functionality has been released in v5.30.0 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!

[github-actions]

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