mypy-boto3-sagemaker-a2i-runtime type annotations

This library provides type annotations (stubs) for the `boto3` client and resources related to the AWS SageMaker Augmented AI Runtime (A2I) service. It allows static type checkers like MyPy to validate code using `boto3` for this specific AWS service, catching potential errors before runtime. The current version is `1.42.3`, and releases are frequent, typically in sync with `boto3` updates and `mypy-boto3-builder` improvements.