Quoter tool

[LPeter1997]

It's quite painful having to type out parse-tree expressions for a test-case (and eventually probably other things too). We should ship a tool that can dump Draco code as a syntax tree expression, similarly to Roslyn-quoter. For now it's enough if it only supports C# as the target language. I suggest using Scriban templates, so eventually when we do want Draco code to be emitted, we can do that.

The tool can be built into the compiler as a command or as a separate CLI tool. It would be nice to be able to ship this with the playground as well.

[Kuinox]

I think we can ship this tool in the vscode extension.

[LPeter1997]

@Kuinox It would probably lie in the language server itself as a custom command or something, but the functionality itself should come from the core compiler itself, as it's the thing knowing the syntax tree API