Create shoot network - VpcNetwork kind

[tmilos77]

Decision: kyma-project/community#989

Create new VpcNetwork kind which reconciliation will create VPC network in the provider same way Gardener does with all necessary IDs in output that should be given to Shoot so it can create a runtime cluster in that VPC.

Example manifest

apiVersion: cloud-control.kyma-project.io/v1beta1
kind: VpcNetwork
metadata: 
  name: test
  namespace: kcp-system
spec:
  subscription: subscription-aws
  cidrBlocks:
    - "10.250.0.0/16"
  region: us-east-1 # required for AWS