Import VPC example

[ytsarev]

Description of your changes

Example demonstrating the ability to automate import process for the specific resource with the inline data source

I have:

• Run make reviewable to ensure this PR is ready for review.

How has this code been tested

k apply -f definition.yaml
k apply -f composition.yaml
k apply -f xsubnet.yaml

k get managed
NAME                                                    READY   SYNCED   EXTERNAL-NAME           AGE
vpc.ec2.aws.upbound.io/subnet-with-imported-vpc-sspww   True    True     vpc-0765383aaaff2249c   13m

NAME                                                       READY   SYNCED   EXTERNAL-NAME              AGE
subnet.ec2.aws.upbound.io/subnet-with-imported-vpc-k4r9f   True    True     subnet-0f03b7dcc6424ebe5   17m

NAME                                                     READY   SYNCED   AGE
workspace.tf.upbound.io/subnet-with-imported-vpc-xfnwz   True    True    17m