Replacing the default boto3 session with a custom one

[adhorn]

Is your feature request related to a problem? Please describe.

I would like to replace the default boto3 powertools client and provide my own boto3 session to record local calls using Placebo

Describe the solution you'd like

For example, here's how you could inject a Placebo client for local tests:

import placebo
import boto3
from aws_lambda_powertools.utilities import Parameters

session = boto3.Session()
pill = placebo.attach(session, data_path=PLACEBO_PATH)
pill.playback()
client = session.client('appconfig')
Parameters.set_boto3_client(client)

something like this...?

[boring-cyborg]

Thanks for opening your first issue here! We'll come back to you as soon as we can.