Generaralised instance meta-data queries

[wbecker]

There are a whole bunch of instance meta-data endpoints that are available. This system does one thing well, but I wonder if its worth also providing a query function so that the user can get the state of the other values (this already gets the ec2 instance identifier, why not allow other things?)

Full list here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instancedata-data-categories.html