Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stubs/simplejson/simplejson/__init__.pyi

@@ -0,0 +1,12 @@
+from typing import IO, Any, Text, Union
+
+from simplejson.decoder import JSONDecoder as JSONDecoder
+from simplejson.encoder import JSONEncoder as JSONEncoder, JSONEncoderForHTML as JSONEncoderForHTML
+from simplejson.scanner import JSONDecodeError as JSONDecodeError
+
+_LoadsString = Union[Text, bytes, bytearray]
+
+def dumps(obj: Any, *args: Any, **kwds: Any) -> str: ...
+def dump(obj: Any, fp: IO[str], *args: Any, **kwds: Any) -> None: ...
+def loads(s: _LoadsString, **kwds: Any) -> Any: ...
+def load(fp: IO[str], **kwds: Any) -> Any: ...

stubs/simplejson/simplejson/decoder.pyi

@@ -0,0 +1,6 @@
+from typing import Match
+
+class JSONDecoder(object):
+    def __init__(self, **kwargs): ...
+    def decode(self, s: str, _w: Match[str], _PY3: bool): ...
+    def raw_decode(self, s: str, idx: int, _w: Match[str], _PY3: bool): ...

stubs/simplejson/simplejson/encoder.pyi

@@ -0,0 +1,9 @@
+from typing import Any
+
+class JSONEncoder(object):
+    def __init__(self, *args, **kwargs): ...
+    def encode(self, o: Any): ...
+    def default(self, o: Any): ...
+    def iterencode(self, o: Any, _one_shot: bool): ...
+
+class JSONEncoderForHTML(JSONEncoder): ...

stubs/simplejson/simplejson/scanner.pyi

@@ -0,0 +1,11 @@
+from typing import Optional
+
+class JSONDecodeError(ValueError):
+    msg: str = ...
+    doc: str = ...
+    pos: int = ...
+    end: Optional[int] = ...
+    lineno: int = ...
+    colno: int = ...
+    endlineno: Optional[int] = ...
+    endcolno: Optional[int] = ...