Gradle Project Support

[milesziemer]

The language server currently has pretty much no idea how to load Smithy Gradle projects. It only knows about smithy-build.json and .smithy-project.json. This means if you're using the Smithy Gradle Plugin, the server can't figure out which .smithy files are part of your project, what dependencies you have, or when to reload the project (because you've changed either of those things).

Ideally, Gradle projects work in the language server pretty much the same way as other projects, but we need to figure out the sources and dependencies. This is a pretty open problem - you can technically use .smithy-project.json, but you'd have to set it up manually. At the very least, we need to detect a Gradle project.