Add stub for emoji.is_emoji (#8053)

Author: vdonato

stubs/emoji/emoji/__init__.pyi

@@ -7,6 +7,7 @@ from .core import (
     emoji_list as emoji_list,
     emojize as emojize,
     get_emoji_regexp as get_emoji_regexp,
+    is_emoji as is_emoji,
     replace_emoji as replace_emoji,
     version as version,
 )

stubs/emoji/emoji/core.pyi

@@ -45,3 +45,4 @@ def distinct_emoji_lis(string: str, language: str | type[_DeprecatedParameter] =
 def distinct_emoji_list(string: str) -> list[str]: ...
 def emoji_count(string: str, unique: bool = ...) -> int: ...
 def version(string: str) -> float: ...
+def is_emoji(string: str) -> bool: ...