PY-44974 PEP 604: Support Python3.10 unions

Support | syntax for python unions.
Also support type | None as a new style for Optional.
Fix highlighting unresolved reference issues with | syntax.
Type inference from isinstance and issubclass.
Add quick fix to switch to old-style syntax in earlier python versions (<3.10)
Fix quick documentation to render new syntax.

(cherry picked from commit 6a64ee12c2d8503a0ef102e8b67cb0b95ce77999)

IJ-MR-8400

GitOrigin-RevId: c26b868fc61f26936a3316ec06f78b66d75f6857

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInIsInstance.py

@@ -0,0 +1,4 @@
+class A:
+    pass
+
+assert isinstance(A(), <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInIsInstance_after.py

@@ -0,0 +1,4 @@
+class A:
+    pass
+
+assert isinstance(A(), (int, str))

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInIsSubclass.py

@@ -0,0 +1,4 @@
+class A:
+    pass
+
+assert issubclass(A, <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>)

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInIsSubclass_after.py

@@ -0,0 +1,4 @@
+class A:
+    pass
+
+assert issubclass(A, <caret>(int, str))

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInReturn.py

@@ -0,0 +1,2 @@
+def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str</warning>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInReturnComplexType.py

@@ -0,0 +1,2 @@
+def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str | list[dict[int, str]] | set[list[int]] | dict[str, int]</warning>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInReturnComplexType_after.py

@@ -0,0 +1,5 @@
+from typing import Union
+
+
+def foo() -> Union[int, str, list[dict[int, str]], set[list[int]], dict[str, int]]:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxInReturn_after.py

@@ -0,0 +1,5 @@
+from typing import Union
+
+
+def foo() -> Union[int, str]:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntNoneStrWithUnion.py

@@ -0,0 +1,2 @@
+def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | None | str</warning>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntNoneStrWithUnion_after.py

@@ -0,0 +1,5 @@
+from typing import Union
+
+
+def foo() -> <caret>Union[int, None, str]:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntNoneWithOptional.py

@@ -0,0 +1,2 @@
+def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">int<caret> | None</warning>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntNoneWithOptional_after.py

@@ -0,0 +1,5 @@
+from typing import Optional
+
+
+def foo() -> Opt<caret>ional[int]:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntStrNoneWithUnion.py

@@ -0,0 +1,2 @@
+def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y"><caret>int | str | None</warning>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxIntStrNoneWithUnion_after.py

@@ -0,0 +1,5 @@
+from typing import Union
+
+
+def foo() -> <caret>Union[int, str, None]:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxNoneIntWithOptional.py

@@ -0,0 +1,2 @@
+def foo() -> <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">None | int<caret></warning>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxNoneIntWithOptional_after.py

@@ -0,0 +1,5 @@
+from typing import Optional
+
+
+def foo() -> Optional[int]<caret>:
+    return 42

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxParenthesizedUnions.py

@@ -0,0 +1,4 @@
+class A:
+    pass
+
+assert isinstance(A(), <warning descr="Python versions 2.7, 3.5, 3.6, 3.7, 3.8, 3.9 do not allow writing union types as X | Y">(int<caret> | str | (list[str] | bool | float)) | dict[str, int]</warning>)

python/testData/quickFixes/PyReplaceWithOldStyleUnionQuickFixTest/bitwiseOrUnionReplacedByOldSyntaxParenthesizedUnions_after.py

@@ -0,0 +1,4 @@
+class A:
+    pass
+
+assert isinstance(A(), (int<caret>, str, list[str], bool, float, dict[str, int]))