Add component_type optional field

[smaeda-ks]

to support specifying the exact build image when multiple images exist in the same provider and region for a given iteration.

Porting over from:
hashicorp/terraform-provider-hcp#347

tests

Select the most recent one (fallback to the current behavior):

data "hcp-packer-iteration" "ubuntu" {
  bucket_name = "learn-packer-ubuntu"
  channel     = "development"
}

data "hcp-packer-image" "ubuntu-west" {
  bucket_name    = "learn-packer-ubuntu"
  iteration_id   = data.hcp-packer-iteration.ubuntu.id
  cloud_provider = "aws"
  region         = "us-west-1"
}

locals {
  image = data.hcp-packer-image.ubuntu-west
}

Select the exact image:

data "hcp-packer-iteration" "ubuntu" {
  bucket_name = "learn-packer-ubuntu"
  channel     = "development"
}

data "hcp-packer-image" "ubuntu-west" {
  bucket_name    = "learn-packer-ubuntu"
  iteration_id   = data.hcp-packer-iteration.ubuntu.id
  cloud_provider = "aws"
  region         = "us-west-1"
  component_type = "amazon-ebs.basic-example-west" // provide an optional field
}

locals {
  image = data.hcp-packer-image.ubuntu-west
}

Error if the specified component_type is not found:

data "hcp-packer-iteration" "ubuntu" {
  bucket_name = "learn-packer-ubuntu"
  channel     = "development"
}

data "hcp-packer-image" "ubuntu-west" {
  bucket_name    = "learn-packer-ubuntu"
  iteration_id   = data.hcp-packer-iteration.ubuntu.id
  cloud_provider = "aws"
  region         = "us-west-1"
  component_type = "foo-bar" // provide an optional field
}

locals {
  image = data.hcp-packer-image.ubuntu-west
}

[sylviamoss]

Thanks for opening this PR! Looking good. 🎉
I added a comment about the docs and it is not being rendered.

[lbajolet-hashicorp]

LGTM

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