Updated aws provider to use credentials from the provider config when #221

[santoshameti]

Updated aws provider to use credentials from provider config when available. Updated the client documentation as well to reflect the names of the config inline with aws documentation.

I have run pre-commit on the changes. Tests are running except a small subset that need api key set.

Issue #221

[mauro13983]

Please do not use boto3.client()
Instead use:

session = boto3.Session(
    aws_access_key_id=self.aws_access_key_id,
    aws_secret_access_key=self.aws_secret_access_key,
)
return session.client(
    "bedrock-runtime", 
    region_name=self.region_name,
)

boto3.client() internally creates a singleton Session objcet, that is created only once (problematic for web applications).
I've created a pull request with the correct implementation:
#233