Add support for Equinix resources

[displague]

One of the goals of inframap is to support different cloud providers and their resources. In this context, we as users, are interested in support for the Equinix provider, which offers a variety of cloud infra resources such as network connections, BGP networks, interconnects, IP addresses, virtual devices and bare metal servers. These resources are similar to those of other providers already supported by inframap.

To add a new provider to inframap, we need to follow the steps described in the CONTRIBUTING.md file. This involves creating a new folder under the providers directory with the provider name and implementing the required functions to parse and generate the graph from the HCL files. We also need to write tests and documentation for the new provider.

We believe that adding support for the Equinix provider would be beneficial for inframap users who want to visualize their cloud infrastructures using Terraform modules. This would also align with an issue open in Equinix Labs that requests a way to automate the production of meaningful graphs in Terraform modules README docs. We welcome any feedback or contribution on this topic.

(^ reworded via ChatGPT 🤖)

https://github.com/cycloidio/inframap/blob/master/CONTRIBUTING.md#add-a-new-provider

Related to equinix-labs/terraform-equinix-template#5