split the volumes on the nodes from one to two

right now the nodes use one single volume, split them up to two (one 50 and one 100 gb) and assign kms keys to them

use the following example from CNAP https://repo1.dso.mil/platform-one/private/cnap/terraform/modules/terraform-aws-eks/-/blob/main/main.tf?ref_type=heads#L123