Re-organize directory structure (#4971)

See discussion in #2491

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

stubs/tabulate/METADATA.toml

@@ -0,0 +1,2 @@
+version = "0.1"
+python2 = true

stubs/tabulate/tabulate.pyi

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+from typing import Any, Callable, Container, Dict, Iterable, List, Mapping, NamedTuple, Optional, Sequence, Union
+
+PRESERVE_WHITESPACE: bool
+WIDE_CHARS_MODE: bool
+tabulate_formats: List[str]
+
+class Line(NamedTuple):
+    begin: str
+    hline: str
+    sep: str
+    end: str
+
+class DataRow(NamedTuple):
+    begin: str
+    sep: str
+    end: str
+
+_TableFormatLine = Union[None, Line, Callable[[List[int], List[str]], str]]
+_TableFormatRow = Union[None, DataRow, Callable[[List[Any], List[int], List[str]], str]]
+
+class TableFormat(NamedTuple):
+    lineabove: _TableFormatLine
+    linebelowheader: _TableFormatLine
+    linebetweenrows: _TableFormatLine
+    linebelow: _TableFormatLine
+    headerrow: _TableFormatRow
+    datarow: _TableFormatRow
+    padding: int
+    with_header_hide: Optional[Container[str]]
+
+def simple_separated_format(separator: str) -> TableFormat: ...
+def tabulate(
+    tabular_data: Union[Mapping[str, Iterable[Any]], Iterable[Iterable[Any]]],
+    headers: Union[str, Dict[str, str], Sequence[str]] = ...,
+    tablefmt: Union[str, TableFormat] = ...,
+    floatfmt: Union[str, Iterable[str]] = ...,
+    numalign: Optional[str] = ...,
+    stralign: Optional[str] = ...,
+    missingval: Union[str, Iterable[str]] = ...,
+    showindex: Union[str, bool, Iterable[Any]] = ...,
+    disable_numparse: Union[bool, Iterable[int]] = ...,
+    colalign: Optional[Iterable[Optional[str]]] = ...,
+) -> str: ...