feat: partner interconnect

[rhariady]

Currently when we create interconnect attachment with PARTNER type, GCP will automatically create a router interface and peers for us (with management_type attribute set to MANAGED_BY_ATTACHMENT). Because of this, using interconnect_attachment module from this repo to provision a PARTNER type interconnect will fail because it will try to create another interface and peer, while GCP only allow 1 interface per attachment and IP type (see issue #7)

This PR will allow interface (and peer) creation to be optional by introducing new value named create_interface. When the value is false, it won't create the interface and peers resource. User can later import this resources from the one automatically generated by GCP.

This PR also add edge_availability_domain argument and set default value for several variable so it will work right away with PARTNER interconnect type.

module "interconnect" {
  source = "./interconnect_attachment"

  name         = "test-interconnect"
  description  = "test"
  type         = "PARTNER"
  project      = "prj-test-interconnect"
  region       = "asia-southeast2"
  router       = module.interconnect_cloud_router.router.name
  mtu          = "1440"

  edge_availability_domain = "AVAILABILITY_DOMAIN_1"

  create_interface = false

  admin_enabled = false
}

Fix #7

[imrannayer]

@rhariady thx for the PR.
See my comments

[rhariady]

@rhariady thx for the PR. See my comments

Thanks @imrannayer! And I think I have followed up all your comment.

BTW, I also add moved block to moved module.interface to module.interface[0] in interconnect_attachment module, so it will working for existing usage.

[imrannayer]

@rhariady lint test failed

[rhariady]

@rhariady lint test failed

@imrannayer Ahh, yes. I was using latest version of terraform-docs.

Fixed BTW.

[imrannayer]

@rhariady can u plz resolve the conflicts

[rhariady]

@rhariady can u plz resolve the conflicts
resolved @imrannayer. And i fixed issue the last lint error as well, hope it's all good now.

[imrannayer]

/gcbrun