Expand tokenize stub to include Intnumber etc (#3839)

The all uppercase tokens, as well as tok_name mentioned in the comment
actually come from the `from token import *`.

stdlib/3/tokenize.pyi

@@ -1,13 +1,8 @@
-from typing import Any, Callable, Generator, Iterable, List, NamedTuple, Optional, Pattern, Union, Sequence, TextIO, Tuple
+from typing import Any, Callable, Dict, Generator, Iterable, List, NamedTuple, Optional, Pattern, Union, Sequence, Set, TextIO, Tuple
 from builtins import open as _builtin_open
 import sys
 from token import *  # noqa: F403
 
-if sys.version_info < (3, 7):
-    COMMENT: int
-    NL: int
-    ENCODING: int
-
 cookie_re: Pattern[str]
 blank_re: Pattern[bytes]
 
@@ -28,7 +23,7 @@ class TokenInfo(_TokenInfo):
 _Token = Union[TokenInfo, Sequence[Union[int, str, _Position]]]
 
 class TokenError(Exception): ...
-class StopTokenizing(Exception): ...
+class StopTokenizing(Exception): ...  # undocumented
 
 class Untokenizer:
     tokens: List[str]
@@ -40,6 +35,8 @@ class Untokenizer:
     def untokenize(self, iterable: Iterable[_Token]) -> str: ...
     def compat(self, token: Sequence[Union[int, str]], iterable: Iterable[_Token]) -> None: ...
 
+# the docstring says "returns bytes" but is incorrect --
+# if the ENCODING token is missing, it skips the encode
 def untokenize(iterable: Iterable[_Token]) -> Any: ...
 def detect_encoding(readline: Callable[[], bytes]) -> Tuple[str, Sequence[bytes]]: ...
 def tokenize(readline: Callable[[], bytes]) -> Generator[TokenInfo, None, None]: ...
@@ -48,70 +45,61 @@ def generate_tokens(readline: Callable[[], str]) -> Generator[TokenInfo, None, N
 if sys.version_info >= (3, 6):
     from os import PathLike
     def open(filename: Union[str, bytes, int, PathLike[Any]]) -> TextIO: ...
-else:
+elif sys.version_info >= (3, 2):
     def open(filename: Union[str, bytes, int]) -> TextIO: ...
 
-# Names in __all__ with no definition:
-#   AMPER
-#   AMPEREQUAL
-#   ASYNC
-#   AT
-#   ATEQUAL
-#   AWAIT
-#   CIRCUMFLEX
-#   CIRCUMFLEXEQUAL
-#   COLON
-#   COMMA
-#   DEDENT
-#   DOT
-#   DOUBLESLASH
-#   DOUBLESLASHEQUAL
-#   DOUBLESTAR
-#   DOUBLESTAREQUAL
-#   ELLIPSIS
-#   ENDMARKER
-#   EQEQUAL
-#   EQUAL
-#   ERRORTOKEN
-#   GREATER
-#   GREATEREQUAL
-#   INDENT
-#   ISEOF
-#   ISNONTERMINAL
-#   ISTERMINAL
-#   LBRACE
-#   LEFTSHIFT
-#   LEFTSHIFTEQUAL
-#   LESS
-#   LESSEQUAL
-#   LPAR
-#   LSQB
-#   MINEQUAL
-#   MINUS
-#   NAME
-#   NEWLINE
-#   NOTEQUAL
-#   NT_OFFSET
-#   NUMBER
-#   N_TOKENS
-#   OP
-#   PERCENT
-#   PERCENTEQUAL
-#   PLUS
-#   PLUSEQUAL
-#   RARROW
-#   RBRACE
-#   RIGHTSHIFT
-#   RIGHTSHIFTEQUAL
-#   RPAR
-#   RSQB
-#   SEMI
-#   SLASH
-#   SLASHEQUAL
-#   STAR
-#   STAREQUAL
-#   STRING
-#   TILDE
-#   VBAR
-#   VBAREQUAL
-#   tok_name
+def group(*choices: str) -> str: ...  # undocumented
+def any(*choices: str) -> str: ...  # undocumented
+def maybe(*choices: str) -> str: ...  # undocumented
+
+Whitespace: str  # undocumented
+Comment: str  # undocumented
+Ignore: str  # undocumented
+Name: str  # undocumented
+
+Hexnumber: str  # undocumented
+Binnumber: str  # undocumented
+Octnumber: str  # undocumented
+Decnumber: str  # undocumented
+Intnumber: str  # undocumented
+Exponent: str  # undocumented
+Pointfloat: str  # undocumented
+Expfloat: str  # undocumented
+Floatnumber: str  # undocumented
+Imagnumber: str  # undocumented
+Number: str  # undocumented
+
+def _all_string_prefixes() -> Set[str]: ...  # undocumented
+
+StringPrefix: str  # undocumented
+
+Single: str  # undocumented
+Double: str  # undocumented
+Single3: str  # undocumented
+Double3: str  # undocumented
+Triple: str  # undocumented
+String: str  # undocumented
+
+if sys.version_info < (3, 7):
+    Operator: str  # undocumented
+    Bracket: str  # undocumented
+
+Special: str  # undocumented
+Funny: str  # undocumented
+
+PlainToken: str  # undocumented
+Token: str  # undocumented
+
+ContStr: str  # undocumented
+PseudoExtras: str  # undocumented
+PseudoToken: str  # undocumented
+
+endpats: Dict[str, str]  # undocumented
+if sys.version_info < (3, 6):
+    single_quoted: Dict[str, str]  # undocumented
+    triple_quoted: Dict[str, str]  # undocumented
+else:
+    single_quoted: Set[str]  # undocumented
+    triple_quoted: Set[str]  # undocumented
+
+tabsize: int  # undocumented