Evaluation of command arguments (#1801)

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* Finish adding the baseline refactors for argument invocation

* Finish cleanup and add test

* Add missing plugin references

src/plugins/nu_plugin_stable_parse.rs

@@ -0,0 +1,7 @@
+use nu_plugin::serve_plugin;
+use nu_plugin_parse::Parse;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    serve_plugin(&mut Parse::new()?);
+    Ok(())
+}