Track line and column number in reported lint location

[carolynvs]

In order for an editor to highlight the location of lint errors, we need to report back the line and column. I think we can achieve that using v3 of the yaml library.

See

• https://godoc.org/gopkg.in/yaml.v3#Node
• Exposing line numbers in the API go-yaml/yaml#108

We are thinking that this would require passing structured data to the mixins for just the lint command that contains the line data, maybe more. This would need a spike to figure out how to do this isolating Porter from the Node structs, and not requiring mixins to reinvent the wheel over and over, or have to use Go.

Manifest wide will want linting, this isn't just for the mixins.