feat: added dynamic_keyvault_certificates to caf_solution

[nusrath432]

Issue-ID: 447

PR Checklist

---

• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.
• [X] My code follows the code style of this project.
• [X] I ran lint checks locally prior to submission.
• [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Description

dynamic_keyvault_certificates have been added to v.5.6.1 modules.

Does this introduce a breaking change

• [ ] YES
• [X] NO

Testing

Define a *.tfvars as:

dynamic_keyvault_certificates = {
  my_kv_name = {
    dynamic_certificate_pem = {
      secret_name = "my-secret-name"
      contents    = "<base64 encoded pem>"
    }
  }
}