Show resource providers available at a node

[ccicconetti]

Try:

edgeless_node_d --available-resources

[franvipa]

It's an interesting functionality. I think it would be useful to have an additional arg that allows to enable JSON output format. I've created a commit with it.
Try:
edgeless_node_d --available-resources --output-json

[ccicconetti]

--available-resources --output-json

Very nice @franvipa!

I did a minor refactoring, which should simplify maintenance when (if?) we add more fields to the resource provider descriptors. The output should be 100% compatible with what you did.

If you agree, please approve the PR.