Rename to Jet, update to Equinix TF 1.8.0

[displague]

Description of your changes

• Renames the project from provider-tf-equinix to provider-jet-equinix
• Updates the TF provider from 1.3.0 to 1.8.0 (which now includes Metal support, provider-tf-equinix-metal can be retired when this is released)
• Syncs with changes from provider-jet-template@d938ff2

Fixes #4

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

# install kind, create kind cluster
# install crossplane-cli
#  curl -sL https://raw.githubusercontent.com/crossplane/crossplane/master/install.sh | sh
# install crossplane (for packages and compositions)
# https://crossplane.io/docs/v1.9/reference/install.html#stable
make
find package/crds -name \*yaml -exec kubectl apply -f {} \;
make run
# configure provider main.tf.json https://blog.crossplane.io/deep-dive-into-terrajet-part-iii/

TODO

• incorporate Equinix Metal examples
• incorporate Equinix Metal credentials if needed (seems it may not be in the new Crossplane model).
  Remove the custom credential environment variables definitions if they are not needed.
• update to latest Equinix TF Provider (1.8.1 at time of todo'ing)
• get provider-jet-equinix image repositories created (package and controller, multiple architectures)
  legacy repos: https://hub.docker.com/search?q=provider-tf-equinix-&source=verified
  Persisting the legacy image repositories shouldn't be needed if there has been little recent activity.
• get this repo renamed to provider-jet-equinix
  I believe this can happen at anytime. GH redirects will take care of legacy links.