Add formatter support for call and class definition Arguments (#6274)

## Summary

This PR leverages the `Arguments` AST node introduced in #6259 in the
formatter, which ensures that we correctly handle trailing comments in
calls, like:

```python
f(
  1,
  # comment
)

pass
```

(Previously, this was treated as a leading comment on `pass`.)

This also allows us to unify the argument handling across calls and
class definitions.

## Test Plan

A bunch of new fixture tests, plus improved Black compatibility.

crates/ruff_python_formatter/src/other/mod.rs

@@ -1,4 +1,5 @@
 pub(crate) mod alias;
+pub(crate) mod arguments;
 pub(crate) mod comprehension;
 pub(crate) mod decorator;
 pub(crate) mod elif_else_clause;