feat(sdk): add support for custom boto3 client

[leandrodamascena]

closes #181

Summary

This PR adds support for passing a custom boto3 Lambda client to the @durable_execution decorator via a new boto3_client parameter. This allows users to customize the client configuration for checkpoint and state management operations.

import boto3
from botocore.config import Config
from aws_durable_execution_sdk_python import durable_execution, DurableContext

custom_lambda_client = boto3.client(
    'lambda',
    config=Config(
        retries={'max_attempts': 5, 'mode': 'adaptive'},
        connect_timeout=10,
        read_timeout=60,
    )
)

@durable_execution(boto3_client=custom_lambda_client)
def handler(event: dict, context: DurableContext) -> dict:
return {"status": "success"}

Hey team, feel free to close if doesn't make sense.

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[leandrodamascena]

We might need to import boto3-stubs as development dependencies to remove ignores like this.

https://youtype.github.io/boto3_stubs_docs/

[leandrodamascena]

mypy isn't running in strict mode in this project, so I'm not adding overload methods. I don't think we need them, but let me know what you think.

[ghost]

Adding the message from the PR here because CI is broken:

---

This PR adds support for passing a custom boto3 Lambda client to the @durable_execution decorator via a new boto3_client parameter. This allows users to customize the client configuration for checkpoint and state management operations.

import boto3
from botocore.config import Config
from aws_durable_execution_sdk_python import durable_execution, DurableContext

custom_lambda_client = boto3.client(
    'lambda',
    config=Config(
        retries={'max_attempts': 5, 'mode': 'adaptive'},
        connect_timeout=10,
        read_timeout=60,
    )
)

@durable_execution(boto3_client=custom_lambda_client)
def handler(event: dict, context: DurableContext) -> dict:
    return {"status": "success"}

[ghost]

Closed and reopened to trigger new build

[ghost]

Thanks Leo for the PR! Exactly what I had in mind.

@yaythomas your call if we want to include in launch.