cli: initial wsl control server

Adds an stdin/out json rpc server for wsl.

Exposes a singular install_local command to install+boot the vscode server on a port from a local archive.

Also refines the common rpc layer some more. I'm decently happy with it now.

cli/src/log.rs

@@ -135,6 +135,7 @@ impl Clone for Box<dyn LogSink> {
 	}
 }
 
+/// The basic log sink that writes output to stdout, with colors when relevant.
 #[derive(Clone)]
 pub struct StdioLogSink {
 	level: Level,
@@ -247,6 +248,17 @@ impl Logger {
 		}
 	}
 
+	/// Creates a new logger with the sink replace with the given sink.
+	pub fn with_sink<T>(&self, sink: T) -> Logger
+	where
+		T: LogSink + 'static,
+	{
+		Logger {
+			sink: vec![Box::new(sink)],
+			..self.clone()
+		}
+	}
+
 	pub fn get_download_logger<'a>(&'a self, prefix: &'static str) -> DownloadLogger<'a> {
 		DownloadLogger {
 			prefix,