Support hexadecimal and base64 encoded DER certificates

[manicminer]

For azuread_application_certificate and azuread_service_principal_certificate resources.

Adds an encoding property which defaults to "pem" and supports:

• pem - the currently supported PEM encoding
• base64 - base64 encoded DER certificate
• hex - hexadecimal encoded DER certificate, i.e. as exported by azurerm_key_vault_certificate

Closes: #385

[manicminer]

Test results

[katbyte]

LGTM 👍

[ghost]

This has been released in version 1.3.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azuread" {
    version = "~> 1.3.0"
}
# ... other configuration ...

[ghost]

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