[docutils] Add items to docutils.node (#10102)

* Add class paragraph
* Add class TextElement
* Add Element.index(), .remove(), and .insert()

Author: danieleades

stubs/docutils/docutils/nodes.pyi

@@ -1,9 +1,10 @@
+import sys
 import xml.dom.minidom
 from _typeshed import Incomplete
 from abc import abstractmethod
 from collections.abc import Callable, Generator, Iterable, Iterator, Sequence
 from typing import Any, ClassVar, Protocol, TypeVar, overload
-from typing_extensions import Literal, Self
+from typing_extensions import Literal, Self, SupportsIndex
 
 from docutils.transforms import Transformer
 
@@ -79,6 +80,7 @@ class Node:
 
 class Element(Node):
     children: list[Node]
+    rawsource: str
     def __init__(self, rawsource: str = "", *children: Node, **attributes): ...
     def __len__(self) -> int: ...
     def __contains__(self, key: str | Node) -> bool: ...
@@ -105,8 +107,14 @@ class Element(Node):
     def deepcopy(self) -> Self: ...
     def pformat(self, indent: str = "    ", level: int = 0) -> str: ...
     def astext(self) -> str: ...
+    def index(self, item: Node, start: int = 0, stop: int = sys.maxsize) -> int: ...
+    def remove(self, item: Node) -> None: ...
+    def insert(self, index: SupportsIndex, item: Node | Iterable[Node] | None) -> None: ...
     def __getattr__(self, __name: str) -> Incomplete: ...
 
+class TextElement(Element):
+    def __init__(self, rawsource: str = "", text: str = "", *children: Node, **attributes) -> None: ...
+
 class Text(Node, str):
     tagname: ClassVar[str]
     children: tuple[()]
@@ -135,6 +143,8 @@ class document(Root, Structural, Element):
     def astext(self) -> str: ...
     def __getattr__(self, __name: str) -> Incomplete: ...
 
+class paragraph(General, TextElement): ...
+
 class NodeVisitor:
     def __init__(self, document: document): ...
     def __getattr__(self, __name: str) -> Incomplete: ...