feat: Add support for `subnet_configuration` on VPC endpoints #628

Job	Run time
Collect workflow inputs	2s
Max TF pre-commit	1m 3s
Min TF pre-commit (.)	25s
Min TF pre-commit (./examples/ipam)	24s
Min TF pre-commit (./examples/complete)	21s
Min TF pre-commit (./examples/simple)	21s
Min TF pre-commit (./examples/issues)	22s
Min TF pre-commit (./examples/vpc-flow-logs)	24s
Min TF pre-commit (./examples/manage-default-vpc)	22s
Min TF pre-commit (./examples/outpost)	24s
Min TF pre-commit (./examples/separate-route-tables)	19s
Min TF pre-commit (./examples/secondary-cidr-blocks)	22s
Min TF pre-commit (./examples/ipv6-dualstack)	22s
Min TF pre-commit (./examples/ipv6-only)	25s
Min TF pre-commit (./examples/network-acls)	21s
Min TF pre-commit (./modules/vpc-endpoints)	23s
	6m 20s

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