Fix type hint annotations of expire time (#2361)

* fix typehint annotations of expire time.

`ExpiryT` includes `float` type, but params of expiry-time (`ex`, `px`) for methods such as `set`, `expire`, `setnx`, etc. , should be `int`, not `float`.

* add `IntExpiryT` annotation.

* minor fix.

* minor fix.

redis/typing.py

@@ -16,7 +16,7 @@
 DecodedT = Union[str, int, float]
 EncodableT = Union[EncodedT, DecodedT]
 AbsExpiryT = Union[int, datetime]
-ExpiryT = Union[float, timedelta]
+ExpiryT = Union[int, timedelta]
 ZScoreBoundT = Union[float, str]  # str allows for the [ or ( prefix
 BitfieldOffsetT = Union[int, str]  # str allows for #x syntax
 _StringLikeT = Union[bytes, str, memoryview]