Add firewall_id to LNP

[rammanoj]

📝 Description

• Add firewall_id to nodepool

✔️ How to Test

What are the steps to reproduce the issue or verify the changes?

• Run pip install . to install the PR in the local environment.
• Create an LKE-E Cluster and use the below config to create a nodePool with a label.
• Create a NodePool with an existing firewall using the following code and ensure created nodes are attached to provided firewall

# creating for a new pool
client = LinodeClient("<api-token>", "https://api.linode.com/v4beta")
cluster = LKECluster(client, <existing-enterprise-cluster-id>)
node_pool = cluster.node_pool_create("g6-dedicated-2", 3, firewall_id=<firewall-id>)
print(node_pool.firewall_id)

• Update the firewall of the nodepool to a new firewall and ensure it is changed.

# update the node pool and ensure that firewall_id is updated
client = LinodeClient("d48ca47c674a9560c0ef6b81fcda7c459341e960e2154ead8b56e28476851fec", "https://api.linode.com/v4beta")
pool = LKENodePool(client, 763514, 526430)
pool.firewall_id = 3374023
pool.save()
print(pool.firewall_id)

How do I run the relevant unit/integration tests?

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