[docutils] Add parsers.commonmark_wrapper (#14243)

Author: donBarbos

stubs/docutils/@tests/stubtest_allowlist.txt

@@ -9,7 +9,8 @@ docutils.nodes.NodeVisitor.depart_\w+  # Methods are discovered dynamically on c
 docutils.nodes.NodeVisitor.visit_\w+  # Methods are discovered dynamically on commonly-used subclasses
 # these methods take a rawsource parameter that has been deprecated and is completely ignored, so we omit it from the stub
 docutils.nodes.Text.__new__
-docutils.parsers.recommonmark_wrapper
+docutils.parsers.commonmark_wrapper # doesn't exist at runtime of stubtests
+docutils.parsers.recommonmark_wrapper # doesn't exist at runtime of stubtests
 docutils.parsers.rst.directives.admonitions.BaseAdmonition.node_class  # must be overridden by base classes (pseudo-abstract)
 docutils.statemachine.State.nested_sm  # is initialised in __init__
 docutils.statemachine.State.nested_sm_kwargs  # is initialised in __init__

stubs/docutils/docutils/parsers/commonmark_wrapper.pyi

@@ -0,0 +1,10 @@
+from typing import Literal
+from typing_extensions import TypeAlias
+
+from docutils import parsers
+
+_ParserName: TypeAlias = Literal["pycmark", "myst", "recommonmark"]
+
+commonmark_parser_names: tuple[_ParserName, ...]
+Parser: type[parsers.Parser]  # if Parser is None or parser_name is empty string, user cannot import current module
+parser_name: _ParserName