Type alias stub for formatter (#5880)

**Summary** This replaces the `todo!()` with a type alias stub in the
formatter. I added the tests from
704eb40108/parser/src/parser.rs (L901-L936)
as ruff python formatter tests.

**Test Plan** None, testing is part of the actual implementation

crates/ruff_python_formatter/resources/test/fixtures/black/py_312/type_aliases.py

@@ -0,0 +1,5 @@
+type A=int
+type Gen[T]=list[T]
+
+type = aliased
+print(type(42))

crates/ruff_python_formatter/resources/test/fixtures/black/py_312/type_aliases.py.expect

@@ -0,0 +1,5 @@
+type A = int
+type Gen[T] = list[T]
+
+type = aliased
+print(type(42))

crates/ruff_python_formatter/resources/test/fixtures/black/py_312/type_params.py

@@ -0,0 +1,13 @@
+def func  [T ](): pass
+async def func [ T ] (): pass
+class C[ T ] : pass
+
+def all_in[T   :   int,U : (bytes, str),*   Ts,**P](): pass
+
+def really_long[WhatIsTheLongestTypeVarNameYouCanThinkOfEnoughToMakeBlackSplitThisLine](): pass
+
+def even_longer[WhatIsTheLongestTypeVarNameYouCanThinkOfEnoughToMakeBlackSplitThisLine: WhatIfItHadABound](): pass
+
+def it_gets_worse[WhatIsTheLongestTypeVarNameYouCanThinkOfEnoughToMakeBlackSplitThisLine, ItCouldBeGenericOverMultipleTypeVars](): pass
+
+def magic[Trailing, Comma,](): pass

crates/ruff_python_formatter/resources/test/fixtures/black/py_312/type_params.py.expect

@@ -0,0 +1,40 @@
+def func[T]():
+    pass
+
+
+async def func[T]():
+    pass
+
+
+class C[T]:
+    pass
+
+
+def all_in[T: int, U: (bytes, str), *Ts, **P]():
+    pass
+
+
+def really_long[
+    WhatIsTheLongestTypeVarNameYouCanThinkOfEnoughToMakeBlackSplitThisLine
+]():
+    pass
+
+
+def even_longer[
+    WhatIsTheLongestTypeVarNameYouCanThinkOfEnoughToMakeBlackSplitThisLine: WhatIfItHadABound
+]():
+    pass
+
+
+def it_gets_worse[
+    WhatIsTheLongestTypeVarNameYouCanThinkOfEnoughToMakeBlackSplitThisLine,
+    ItCouldBeGenericOverMultipleTypeVars,
+]():
+    pass
+
+
+def magic[
+    Trailing,
+    Comma,
+]():
+    pass

crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/comments2.py

@@ -154,6 +154,9 @@ class Test:
                 not parsed.hostname.strip()):
             pass
 
+
+a = "type comment with trailing space"  # type: str   
+
 #######################
 ### SECTION COMMENT ###
 #######################

crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/comments2.py.expect

@@ -162,6 +162,8 @@ class Test:
             pass
 
 
+a = "type comment with trailing space"  # type: str
+
 #######################
 ### SECTION COMMENT ###
 #######################

crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/ignore_pyi.py

@@ -0,0 +1,20 @@
+def f():  # type: ignore
+    ...
+
+class x:  # some comment
+    ...
+
+class y:
+    ...  # comment
+
+# whitespace doesn't matter (note the next line has a trailing space and tab)
+class z:        
+    ...
+
+def g():
+    # hi
+    ...
+
+def h():
+    ...
+    # bye

crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/ignore_pyi.py.expect

@@ -0,0 +1,18 @@
+def f():  # type: ignore
+    ...
+
+class x:  # some comment
+    ...
+
+class y: ...  # comment
+
+# whitespace doesn't matter (note the next line has a trailing space and tab)
+class z: ...
+
+def g():
+    # hi
+    ...
+
+def h():
+    ...
+    # bye

crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/multiline_consecutive_open_parentheses_ignore.py

@@ -0,0 +1,21 @@
+# This is a regression test. Issue #3737
+
+a = (  # type: ignore
+    int(  # type: ignore
+        int(  # type: ignore
+            int(  # type: ignore
+                6
+            )
+        )
+    )
+)
+
+b = (
+    int(
+        6
+    )
+)
+
+print(   "111") # type: ignore
+print(   "111"                         ) # type: ignore
+print(   "111"       ) # type: ignore

crates/ruff_python_formatter/resources/test/fixtures/black/simple_cases/multiline_consecutive_open_parentheses_ignore.py.expect

@@ -0,0 +1,15 @@
+# This is a regression test. Issue #3737
+
+a = (  # type: ignore
+    int(  # type: ignore
+        int(  # type: ignore
+            int(6)  # type: ignore
+        )
+    )
+)
+
+b = int(6)
+
+print("111")  # type: ignore
+print("111")  # type: ignore
+print("111")  # type: ignore

crates/ruff_python_formatter/resources/test/fixtures/import_black_tests.py

@@ -49,6 +49,7 @@ FIXTURE_SETS = [
     "py_39",
     "py_310",
     "py_311",
+    "py_312",
     "simple_cases",
     "miscellaneous",
     ".",

crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/type_alias.py

@@ -0,0 +1,38 @@
+# Copied from https://github.com/RustPython/Parser/blob/704eb40108239a8faf9bd1d4217e8dad0ac7edb3/parser/src/parser.rs#L901-L936
+
+type X = int
+type X = int | str
+type X = int | "ForwardRefY"
+type X[T] = T | list[X[T]]  # recursive
+type X[T] = int
+type X[T] = list[T] | set[T]
+type X[T, *Ts, **P] = (T, Ts, P)
+type X[T: int, *Ts, **P] = (T, Ts, P)
+type X[T: (int, str), *Ts, **P] = (T, Ts, P)
+
+# soft keyword as alias name
+type type = int
+type match = int
+type case = int
+
+# soft keyword as value
+type foo = type
+type foo = match
+type foo = case
+
+# multine definitions
+type \
+	X = int
+type X \
+	= int
+type X = \
+	int
+type X = (
+    int
+)
+type \
+    X[T] = T
+type X \
+    [T] = T
+type X[T] \
+    = T