Implement basic module formatting (#4784)

* Add Format for Stmt

* Implement basic module formatting

This implements formatting each statement in a module with a hard line break in between, so that we can start formatting statements.

Basic testing is done by the snapshots

crates/ruff_python_formatter/src/module/mod_module.rs

@@ -1,5 +1,8 @@
-use crate::{verbatim_text, FormatNodeRule, PyFormatter};
+use crate::AsFormat;
+use crate::{FormatNodeRule, PyFormatter};
+use ruff_formatter::prelude::hard_line_break;
 use ruff_formatter::{write, Buffer, FormatResult};
+
 use rustpython_parser::ast::ModModule;
 
 #[derive(Default)]
@@ -7,6 +10,9 @@ pub struct FormatModModule;
 
 impl FormatNodeRule<ModModule> for FormatModModule {
     fn fmt_fields(&self, item: &ModModule, f: &mut PyFormatter) -> FormatResult<()> {
-        write!(f, [verbatim_text(item.range)])
+        for stmt in &item.body {
+            write!(f, [stmt.format(), hard_line_break()])?;
+        }
+        Ok(())
     }
 }