Added 'add_fuel' command line option (#3792)

* Added 'add_fuel' command line option

* Added default value to 'add_fuel' config option

* Added 'add_fuel' to run command Store instantiation

* Added comment

* Added warning for add-fuel without consume-fuel

* Formatting

* Changed out --add-fuel and --consume-fuel to --fuel

* Formatting

* Update src/lib.rs

* Update src/commands/run.rs

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>

src/commands/run.rs

@@ -164,6 +164,12 @@ impl RunCommand {
         let engine = Engine::new(&config)?;
         let mut store = Store::new(&engine, Host::default());
 
+        // If fuel has been configured, we want to add the configured
+        // fuel amount to this store.
+        if let Some(fuel) = self.common.fuel {
+            store.add_fuel(fuel)?;
+        }
+
         let preopen_sockets = self.compute_preopen_sockets()?;
 
         // Make wasi available by default.