Add certificate_authority_arn for private CAs

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what

• Add certificate_authority_arn
• Add validation id output
• Add verification of lowercase sans and domain names

why

• For private CAs

references

• https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/acm_certificate
• Thanks to @razorsedge this PR closes https://github.com/cloudposse/terraform-aws-acm-request-certificate/pull/37
• Thanks to @alexjurkiewicz this PR closes https://github.com/cloudposse/terraform-aws-acm-request-certificate/pull/46

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/test all

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/test all

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/test all