Add `tier` argument to `aws_vpc_ipam` resource #6523

Job	Run time
go mod download	20s
markdown-lint	19s
go build	1m 3s
go generate	3m 9s
terraform providers schema	27s
go test	9m 8s
Sweeper Functions Not Linked	2m 37s
importlint	22s
tfproviderdocs	29s
	17m 54s

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