adding start of aws to include instances in solve

[vsoch]

This PR will:

• add support for adding AWS instances to the solve (see picture below, and yes we need to derive our own descriptions)
  
• add plumbing that gets and saves GCP pricing data. Matching these to instances is another thing we will need to think about.
• Start of pluming for AWS prices, but I don't have correct permissions.
• Changed output type for asp file to just --asp because that's what I wanted to use

It's been interesting comparing the two APIs - AWS is a lot richer in terms of metadata for instances. I suspect their pricing API might have more transparency but I haven't seen it yet. I'm also doing my best to have shared functionality for the top level classes (e.g., Instance that is base class for GoogleCloudInstance and AmazonInstance).

Anyway, this is good progress! Still a lot to do, but having fun and will get there :) I'm going to chomp off as many of these TODOs as I can on my own, and when I'm ready to share with the group will write up remaining work into more robust TODOs for the group to think about.

Signed-off-by: vsoch vsoch@users.noreply.github.com