MKAAS-1283 Add support for advanced k8s settings

[gbernady]

Changelog:

• Add authentication.oidc settings to gcore_k8sv2 resource.
• Add autoscaler_config map to gcore_k8sv2 resource (cluster-autoscaler options).
• Add cni.cilium.hubble_relay / cni.cilium.hubble_ui bools to gcore_k8sv2 resource.
• Add pool[*].crio_config map to gcore_k8sv2 resource (cri-o options).
• Add pool[*].kubelet_config map to gcore_k8sv2 resource (kubelet config params).
• Fix cni = null in gcore_k8sv2 data source (cilium block was set as a map not a slice).
• Fix a syntax error in examples/resources/gcore_instance/resource.tf.
• Fix gcore/resource_gcore_lbpool.go file formatting.