[red-knot] Auto generate statement nodes (#16645)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

Part of #15655 

Replaced statement nodes with autogenerated ones. Reused the stuff we
introduced in #16285. Nothing except for copying the nodes to new
format.

## Test Plan

Tests run without any changes. Also moved the test that checks size of
AST nodes to `generated.rs` since all of the structs that it tests are
now there.
<!-- How was it tested? -->

crates/ruff_python_ast/generate.py

@@ -30,6 +30,14 @@ types_requiring_create_prefix = [
     "UnaryOp",
     "BoolOp",
     "Operator",
+    "Decorator",
+    "TypeParams",
+    "Parameters",
+    "Arguments",
+    "ElifElseClause",
+    "WithItem",
+    "MatchCase",
+    "Alias",
 ]