add iam_tags to vault_aws_secret_backend_role

[thyton]

Description

This PR adds iam_tags to vault_aws_secret_backend_role resource, picking up the remaining work on https://github.com/hashicorp/terraform-provider-vault/pull/2087

Closes #1073

Checklist

• [x] Added CHANGELOG entry (only for user-facing changes)
• [x] Acceptance tests where run against all supported Vault Versions

Output from acceptance testing:

~/go/src/github.com/hashicorp/terraform-provider-vault (add-iam-tags-to-aws-secret-backend) $ make testacc TESTARGS='-run=TestAccAWSSecretBackendRole'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test -run=TestAccAWSSecretBackendRole -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage  [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate  [no test files]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.402s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki  [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/sync [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
?       github.com/hashicorp/terraform-provider-vault/util/mountutil    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.584s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider 0.814s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  1.059s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util  1.256s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault 0.766s

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[thyton]

Thank you!