docs(samples): Adding Windows server samples

[m-strzelczyk]

Providing samples needed on the Creating and managing Windows Server instances page.

Test is provided for route samples, as other samples that involve firewall or instance creation are already tested

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• samples/snippets/firewall/windows_kms.py:22, tag compute_create_egress_rule_windows_activation
• samples/snippets/instances/create_start_instance/create_windows_instance.py:22, tag compute_create_windows_instance_internal_ip
• samples/snippets/routes/create.py:22, tag compute_route_create
• samples/snippets/routes/create_kms_route.py:34, tag compute_create_route_windows_activation
• samples/snippets/routes/delete.py:22, tag compute_route_delete
• samples/snippets/routes/list.py:22, tag compute_route_list

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[parthea]

Added minor observations, otherwise LGTM