Update __all__ statements to a simpler form that is better supported by typecheckers (#828)

Update __all__ statements to a simpler form that's better supported by static type checkers like pyright/pylance https://github.com/microsoft/pyright/blob/main/docs/typed-libraries.md#library-interface

Author: bschnurr

asyncpg/__init__.py

@@ -15,7 +15,5 @@
 from ._version import __version__ # NOQA
 
 
-__all__ = (
- ('connect', 'create_pool', 'Pool', 'Record', 'Connection')
- + exceptions.__all__ # NOQA
-)
+__all__ = ('connect', 'create_pool', 'Pool', 'Record', 'Connection')
+__all__ += exceptions.__all__ # NOQA

asyncpg/exceptions/__init__.py

@@ -1040,7 +1040,7 @@ class IndexCorruptedError(InternalServerError):
  sqlstate = 'XX002'
 
 
-__all__ = _base.__all__ + (
+__all__ = (
  'ActiveSQLTransactionError', 'AdminShutdownError',
  'AmbiguousAliasError', 'AmbiguousColumnError',
  'AmbiguousFunctionError', 'AmbiguousParameterError',
@@ -1180,3 +1180,5 @@ class IndexCorruptedError(InternalServerError):
  'WindowingError', 'WithCheckOptionViolationError',
  'WrongObjectTypeError', 'ZeroLengthCharacterStringError'
 )
+
+__all__ += _base.__all__