feat: adding support for automatic creation of psc consumer

[sid-occrp]

When using psc you can optionally create psc consumer for main and read replica in the specified network and subnet.

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[sid-occrp]

@imrannayer @isaurabhuttam how is my PR looking ?

[imrannayer]

/gcbrun

[imrannayer]

/gcbrun

[imrannayer]

@sid-occrp integration test failed

Error: "name" ("your_network_name") doesn't match regexp "^(?:[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?)$"

  with module.network-auto-psc.module.vpc.google_compute_network.network,
  on .terraform/modules/network-auto-psc/modules/vpc/main.tf line 21, in resource "google_compute_network" "network":
  21:   name                                      = var.network_name
}

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