OIDC Authentication Support

[roux-doo]

Description

Requesting to add OIDC authentication arguments that are present on the Terraform Azure providers (oidc_token, oidc_token_file_path, use_oidc). This will allow the Packer plugin to run Azure Commercial and Azure Government builds congruently instead of separately in CI/CD systems such as GitLab that support OIDC.

Potential References

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs#oidc_token