* add support for `google_container_node_pool` management (sans-tests)
* [review] add tests, docs, general cleanup
* add docs
* [review] amend test to check updates and terraform fmt
* test updates, make nested management fields non-computed
* Add preemptible as an option to node config
* Check for preemptible in test matching functions
* Move flattenClusterNodeConfig to node_config
* Handle bools properly when comparing in cluster and node pool tests
* Use a supported image_type in cluster tests
* Add support node config for GKE node pool
* Review fixes:
- Set max items in node config schema
- Fill missing node config fields
- Put test helpers above than test vars
* Update checks in node pool tests
* Fix node pool check match