feat(modelarmor): Added snippets for creating template with labels and metadata

[harshnasitcrest]

Added following samples for Model Armor:

1. Create template with labels
2. Create Template with metadata

Please enable the Model Armor API and grant modelarmor.admin IAM permission on the service account/project that is used in this repo.

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• modelarmor/src/create_template_with_labels.php:29, tag modelarmor_create_template_with_labels
• modelarmor/src/create_template_with_metadata.php:29, tag modelarmor_create_template_with_metadata

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