Support simple resource class selection

[negz]

crossplane/crossplane#926
crossplane/crossplane#927
crossplane/crossplane-runtime#48

Updates angryjet to reflect the above changes.

Description of your changes

Checklist

I have:

• Run make reviewable to ensure this PR is ready for review.
• Ensured this PR contains a neat, self documenting set of commits.

[hasheddan]

How would you feel about incorporating #2 into this PR? Just thinking that if we are going to bump stack dependencies that it might be nice to only have to do so once. Otherwise, LGTM!

[negz]

How would you feel about incorporating #2 into this PR?

I agree with the sentiment, but I'm inclined to tackle it in a separate PR because it's a slightly less trivial change than it might seem. angryjet doesn't know how to write anything but methods at the moment, so we'd probably have to teach generate.WriteMethods how to know whether the methods it was writing should satisfy an interface.

[soorena776]

/LGTM

[soorena776]

@negz FYI, my changes also have a change in the api (adding GetCondition), so you might want to wait until that is checked in, if you don't want to open another pr later

[negz]

@soorena776 Thanks for the heads up. My suspicion is it might be best to add your changes in a separate PR, because it might take me a while to merge this one.

[hasheddan]

I agree with the sentiment, but I'm inclined to tackle it in a separate PR because it's a slightly less trivial change than it might seem.

@negz sounds good!