Add validators schema and code templates

src/templates/rust.handlebars

@@ -0,0 +1,45 @@
+use clap::{Parser, Subcommand};
+
+/// {{spec.description}}
+#[derive(Parser, Debug)]
+#[command(name = "{{spec.name}}")]
+#[command(version = "{{spec.version}}")]
+#[command(author = "{{spec.author}}")]
+#[command(about = "{{escape description}}")]
+struct Args {
+    #[command(subcommand)]
+    command: Option<Command>,
+}
+
+#[derive(Subcommand, Debug)]
+enum Command {
+    {{#each spec.commands}}
+    /// {{escape description}}
+    {{pascalCase name}} {
+        {{#each arguments}}
+        /// {{escape description}}
+        {{#if variadic}}...{{/if}}{{rustArgType type required variadic}} {{camelCase name}},
+        {{/each}}
+        {{#each options}}
+        /// {{escape description}}
+        #[arg(short, long{{#if default}}, default_value = "{{defaultValue}}"{{/if}})]
+        {{camelCase name}}: {{toRustType type}},
+        {{/each}}
+    },
+    {{/each}}
+}
+
+fn main() {
+    let args = Args::parse();
+
+    match args.command {
+        {{#each spec.commands}}
+        Some(Command::{{pascalCase name}} { .. }) => {
+            println!("Running {{name}} command");
+        }
+        {{/each}}
+        None => {
+            println!("Use --help to see available commands");
+        }
+    }
+}