Enhanced Interfaces: Add support for Firewall templates

[lgarber-akamai]

📝 Description

This pull requests adds support for Firewall Templates, which allow API consumers to access Akamai-defined common Firewall rule sets.

NOTE: As of now,Firewall templates are only intended to be accessed by the user and are not intended to be specified at resource creation.

✔️ How to Test

The following test steps assume you have pulled down this PR locally and run make install. Additionally, your Linode account must have access to Enhanced Interfaces.

Unit Testing

make test-unit

Integration Testing

make test-int TEST_COMMAND=models/firewall/test_firewall_templates.py

Manual Testing

1. In a linode_api4-python sandbox environment (e.g. dx-devenv), run the following:

import json
import os

from linode_api4 import LinodeClient

client = LinodeClient(os.getenv("LINODE_TOKEN"), base_url="https://api.linode.com/v4beta")

templates = client.networking.firewall_templates()

for template in templates:
    print(f"{template.slug}:\n{json.dumps(template.rules.dict, indent=4)}\n\n")

2. Ensure the output contains all API-exposed Firewall Templates and their rules.

[ezilber-akamai]

LGTM! All tests are passing locally.

[jriddle-linode]

LGTM and is passing locally, thanks!