Add a helpful message RE Any TF Provider if no registry search results are returned

[jkodroff]

If I search for a provider, and nothing is found, we should make sure the user knows they can use Any TF provider to generate an SDK for any provider that's in the OpenTofu registry.

• Good: a link to the docs showing how to use Any Terraform Provider and a link to the OpenTofu registry (both open in new tabs)
• Better: Dynamically generate a search URI for the OpenTofu registry based on the user's input ew browser tab.
• Best: Automatically search the OpenTofu registry (or give them a button to do the search) and display the results inline alongside a pulumi package add command that also includes the version of the provider (for maximum build repeatability), e.g. pulumi package add terraform-provider hashicorp/random 3.7.1

Good is good enough for me.

[iwahbe]

I like this suggestion.

Best sounds pretty out of scope, but I think Better is pretty achievable.