Add model discovery args to smithy select (#2680)

The gradle plugin's select isn't very useful without being able to
pass along the classpath gradle is responsible for producing.

Author: JordonPhillips

smithy-cli/src/main/java/software/amazon/smithy/cli/commands/SelectCommand.java

@@ -62,6 +62,7 @@ public String getSummary() {
     @Override
     public int execute(Arguments arguments, Env env) {
         arguments.addReceiver(new ConfigOptions());
+        arguments.addReceiver(new DiscoveryOptions());
         arguments.addReceiver(new BuildOptions());
         arguments.addReceiver(new Options());