Re-organize directory structure (#4971)

See discussion in #2491

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

stubs/pytz/METADATA.toml

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

stubs/pytz/pytz/__init__.pyi

@@ -0,0 +1,43 @@
+import datetime
+from typing import List, Mapping, Optional, Set, Union
+
+class BaseTzInfo(datetime.tzinfo):
+    zone: str = ...
+    def localize(self, dt: datetime.datetime, is_dst: Optional[bool] = ...) -> datetime.datetime: ...
+    def normalize(self, dt: datetime.datetime) -> datetime.datetime: ...
+
+class _UTCclass(BaseTzInfo):
+    def tzname(self, dt: Optional[datetime.datetime]) -> str: ...
+    def utcoffset(self, dt: Optional[datetime.datetime]) -> datetime.timedelta: ...
+    def dst(self, dt: Optional[datetime.datetime]) -> datetime.timedelta: ...
+
+class _StaticTzInfo(BaseTzInfo):
+    def tzname(self, dt: Optional[datetime.datetime], is_dst: Optional[bool] = ...) -> str: ...
+    def utcoffset(self, dt: Optional[datetime.datetime], is_dst: Optional[bool] = ...) -> datetime.timedelta: ...
+    def dst(self, dt: Optional[datetime.datetime], is_dst: Optional[bool] = ...) -> datetime.timedelta: ...
+
+class _DstTzInfo(BaseTzInfo):
+    def tzname(self, dt: Optional[datetime.datetime], is_dst: Optional[bool] = ...) -> str: ...
+    def utcoffset(self, dt: Optional[datetime.datetime], is_dst: Optional[bool] = ...) -> Optional[datetime.timedelta]: ...
+    def dst(self, dt: Optional[datetime.datetime], is_dst: Optional[bool] = ...) -> Optional[datetime.timedelta]: ...
+
+class UnknownTimeZoneError(KeyError): ...
+class InvalidTimeError(Exception): ...
+class AmbiguousTimeError(InvalidTimeError): ...
+class NonExistentTimeError(InvalidTimeError): ...
+
+utc: _UTCclass
+UTC: _UTCclass
+
+def timezone(zone: str) -> Union[_UTCclass, _StaticTzInfo, _DstTzInfo]: ...
+def FixedOffset(offset: int) -> Union[_UTCclass, datetime.tzinfo]: ...
+
+all_timezones: List[str]
+all_timezones_set: Set[str]
+common_timezones: List[str]
+common_timezones_set: Set[str]
+country_timezones: Mapping[str, List[str]]
+country_names: Mapping[str, str]
+ZERO: datetime.timedelta
+HOUR: datetime.timedelta
+VERSION: str