Formatting technology for SourceKit-LSP and other tools

[akyrtzi (Argyrios Kyrtzidis)]

@fbartho

Would this perhaps be a candidate directly being executed by Xcode internally to keep our source files formatted appropriately?

When we first announced SourceKit-LSP we mentioned that we intend for Xcode to use it as well, in which case SourceKit-LSP's formatting support would come along with it .