Consider adding launch and build booleans as top-level keys in the build plan

[sclevine]

This convention seems to be used used universally.

[nebhale]

I wouldn't say universally. I think they can be used in buildpacks that contribute to both launch and build, but I don't consider that to be a large percentage of the total population of buildpacks. They're a large percentage today, but that's skewed by the fact that we've implemented a bunch of runtime buildpacks, and almost none of the other types. In the Java realm alone, only 25% of buildpacks require it today and when we're done ~2.5% will require it.

[sclevine]

After hearing your feedback in the WG meeting today, I no longer think we should add this.