Re-organize directory structure (#4971)

See discussion in #2491

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

stubs/orjson/METADATA.toml

@@ -0,0 +1 @@
+version = "0.1"

stubs/orjson/orjson.pyi

@@ -0,0 +1,24 @@
+from typing import Any, Callable, Optional, Union
+
+__version__: str
+
+def dumps(__obj: Any, default: Optional[Callable[[Any], Any]] = ..., option: Optional[int] = ...) -> bytes: ...
+def loads(__obj: Union[bytes, bytearray, str]) -> Any: ...
+
+class JSONDecodeError(ValueError): ...
+class JSONEncodeError(TypeError): ...
+
+OPT_APPEND_NEWLINE: int
+OPT_INDENT_2: int
+OPT_NAIVE_UTC: int
+OPT_NON_STR_KEYS: int
+OPT_OMIT_MICROSECONDS: int
+OPT_PASSTHROUGH_DATACLASS: int
+OPT_PASSTHROUGH_DATETIME: int
+OPT_PASSTHROUGH_SUBCLASS: int
+OPT_SERIALIZE_DATACLASS: int
+OPT_SERIALIZE_NUMPY: int
+OPT_SERIALIZE_UUID: int
+OPT_SORT_KEYS: int
+OPT_STRICT_INTEGER: int
+OPT_UTC_Z: int