add async support to creators api

Author: sergioteula

amazon_creatorsapi/__init__.py

@@ -3,9 +3,17 @@
 A Python wrapper for the Amazon Creators API.
 """
 
+from importlib.util import find_spec
+
 __author__ = "Sergio Abad"
 __all__ = ["AmazonCreatorsApi", "Country", "models"]
 
 from . import models
 from .api import AmazonCreatorsApi
 from .core import Country
+
+# Async support (requires 'async' extra: pip install python-amazon-paapi[async])
+if find_spec("httpx") is not None:
+    from .async_api import AsyncAmazonCreatorsApi
+
+    __all__ += ["AsyncAmazonCreatorsApi"]