Allow logging additional keys as a context manager about powertools-lambda-python HOT 4 OPEN

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Thanks @CaptainDriftwood for submitting this, we will discuss it during our next gathering.

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Simon and I discussed this a minute ago... got a question @CaptainDriftwood - is your intent to have a given set of keys temporarily added for N log statements? OR add N keys for a given log statement?

This feature would make sense for the former*, but the latter is already possible by passing arbitrary keyword arguments to any log statement

*caveat being that this is not thread-safe (append_keys), as we don't use contextvars yet.

from aws_lambda_powertools import Logger
from aws_lambda_powertools.utilities.typing import LambdaContext

logger = Logger()


def lambda_handler(event: dict, context: LambdaContext) -> str:
    # these keys will only be available in this log statement, subsequent `logger.info` won't have them
    logger.info("Collecting payment", request_id="1123", some_key="some_value")

    return "hello world"

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@heitorlessa It would be temporarily added for N log statements. I'm not sure how ya'll would get around the thread safety aspect. That is a good point.

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