AWS S3 Image and Document uploads

[sachinkarve]

Capability to upload Image and Documents sent from WA client to AWS S3.

ConfigFile should look something like

[[pre_processors]]
type = "aws_s3"
name = "aws_s3"
aws_access_key_id="access-key-that-is-on-your-aws-console"
aws_secret_access_key="secret-key-that-is-on-your-aws-console"
region = "us-east-2"
bucket = "bucket-name-that-your-create-on-aws-console"

[[services]]
webhook_path = "/whatsapp"
plugin = "openai_test"
store = "memory_test"
handler = "whatsapp_test"
pre_processors = ["aws_s3"] 

[hunterjackson]

I get that this will be a hard test to write for s3, for the sake of this detail in the description for this PR how you manually tested this and then in a later PR we also need a test for preprocessors in general