implement BGP discover for `equinix_metal_project`

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Description

Equinix Metal projects provide a number of BGP settings. These are exposed in Terraform through a few resources, but are initiated by equinix_metal_project.

One of the resources of the Metal API that has not been exposed in Terraform is the ability to force a sync or discover over BGP neighbors in the project (POST /projects/{id}/bgp/discover).

Create a method to signal this API endpoint via Terraform.

New or Affected Resource(s)

equinix_metal_project

Potential Terraform Configuration

resource "equinix_metal_project" "foo" {
  ...
  bgp_discover_since = "<date>" 
  #  the diff would be based on desired date (bgp_discover_since) > observed state
  #  (determined by updated_dt or finding a matching event).

  # computed field could also be added, but perhaps not necessary?
  # would be named bgp_discovered bgp_last_discovered ? 
}

I don't think bgp_config should be used because the API path for projects/{id}/bgp/config is separate.

https://registry.terraform.io/providers/equinix/equinix/latest/docs/resources/equinix_metal_project#example-with-bgp-config

References

Depends on https://github.com/packethost/packngo/issues/316

equinix / terraform-provider-equinix