Add global and nonlocal formatting (#6170)

## Summary

Adds `global` and `nonlocal` formatting, without the "deviation from
black" outlined in the linked issue, which I'll do separately.

See: https://github.com/astral-sh/ruff/issues/4798.

## Test Plan

Added a fixture in the Ruff-specific directory since the Black fixtures
don't seem to cover this.

crates/ruff_python_formatter/tests/snapshots/format@statement__global.py.snap

@@ -0,0 +1,38 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/global.py
+---
+## Input
+```py
+def f():
+    global x, y, z
+
+
+def f():
+    # leading comment
+    global x, y, z # end-of-line comment
+    # trailing comment
+
+
+def f():
+    global analyze_featuremap_layer, analyze_featuremapcompression_layer, analyze_latencies_post, analyze_motions_layer, analyze_size_model
+```
+
+## Output
+```py
+def f():
+    global x, y, z
+
+
+def f():
+    # leading comment
+    global x, y, z  # end-of-line comment
+    # trailing comment
+
+
+def f():
+    global analyze_featuremap_layer, analyze_featuremapcompression_layer, analyze_latencies_post, analyze_motions_layer, analyze_size_model
+```
+
+
+

crates/ruff_python_formatter/tests/snapshots/format@statement__nonlocal.py.snap

@@ -0,0 +1,38 @@
+---
+source: crates/ruff_python_formatter/tests/fixtures.rs
+input_file: crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/nonlocal.py
+---
+## Input
+```py
+def f():
+    nonlocal x, y, z
+
+
+def f():
+    # leading comment
+    nonlocal x, y, z # end-of-line comment
+    # trailing comment
+
+
+def f():
+    nonlocal analyze_featuremap_layer, analyze_featuremapcompression_layer, analyze_latencies_post, analyze_motions_layer, analyze_size_model
+```
+
+## Output
+```py
+def f():
+    nonlocal x, y, z
+
+
+def f():
+    # leading comment
+    nonlocal x, y, z  # end-of-line comment
+    # trailing comment
+
+
+def f():
+    nonlocal analyze_featuremap_layer, analyze_featuremapcompression_layer, analyze_latencies_post, analyze_motions_layer, analyze_size_model
+```
+
+
+