Creates a new compute node for running analytical workflows. This will provision the necessary
infrastructure in the specified account including ECS tasks, API Gateway, EFS storage, and SQS queues.
If organization_id is provided, the node will be created within that workspace context.
If organization_id is omitted, an organization-independent (private) node will be created.

Permissions: Account owner can always create nodes. On public accounts (isPublic=true),
workspace administrators (permission_bit >= 16) can also create nodes.