Replace LambdaContext class with a Proto and a dataclass

[ghost]

Replaces previous uses of LambdaContext with a dataclass that implements the proto from sdk repo.

Dependencies

If this PR requires testing against a specific branch of the Python Language SDK (e.g., for unreleased changes), uncomment and specify the branch below. Otherwise, leave commented to use the main branch.

PYTHON_LANGUAGE_SDK_BRANCH: lambda-ctx

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[yaythomas]

per review here, https://github.com/aws/aws-durable-execution-sdk-python-testing/pull/54/files

this is a class, not a dict.

maybe make a lightweight dataclass here just for the Testing Lib that incorporate the protocol?

from sdk import LambdaContext as LambdaContextProtocol

@dataclass
class LambdaContext(LambdaContextProtocol):
    aws_request_id: str
    log_group_name: str | None = None
    log_stream_name: str | None = None
    function_name: str | None = None
    memory_limit_in_mb: str | None = None
    function_version: str | None = None
    invoked_function_arn: str | None = None
    tenant_id: str | None = None
    client_context: object | None = None
    identity: object | None = None

    def get_remaining_time_in_millis(self) -> int:
        return 0  # Implementation needed

    def log(self, msg: str) -> None:
        print(msg)  # Implementation needed

[ghost]

Edit: Clarified offline. Will use class instead.