feat: added s3 artifact service

pyproject.toml

@@ -146,6 +146,7 @@ docs = [
 extensions = [
   "anthropic>=0.43.0",                          # For anthropic model support
   "beautifulsoup4>=3.2.2",                      # For load_web_page tool.
+  "boto3>=1.28.0",                              # For S3ArtifactService
   "crewai[tools];python_version>='3.10' and python_version<'3.12'",       # For CrewaiTool; chromadb/pypika fail on 3.12+
   "docker>=7.0.0",                              # For ContainerCodeExecutor
   "kubernetes>=29.0.0",                         # For GkeCodeExecutor

src/google/adk/artifacts/__init__.py

@@ -16,10 +16,12 @@
 from .file_artifact_service import FileArtifactService
 from .gcs_artifact_service import GcsArtifactService
 from .in_memory_artifact_service import InMemoryArtifactService
+from .s3_artifact_service import S3ArtifactService
 
 __all__ = [
     'BaseArtifactService',
     'FileArtifactService',
     'GcsArtifactService',
     'InMemoryArtifactService',
+    'S3ArtifactService',
 ]