define support matrix

[mattsb42-aws]

We need to properly define what "support" means for our projects, specifically with relation to language runtimes/versions. We should define that here in a single place and reference this matrix in defining the runtime/version support for each project.

[mattsb42-aws]

Another thing we need to define here is the process for what needs to happen to move a runtime/version from one support level to another.