The AWS request signing filter and AWS Lambda filter uses default credentials provider chain to get the AWS credentials. Is it possible to add option on aws/v3/credential_provider.proto so that the user has option to pick the exact credentials provider they want to use. This will help with optimizing the flow to pick the right credentials provider and execution don't have to go through the list of credentials provider one by one, thereby optimizing the flow.

Example: Say the DefaultCredentialsChain uses a chain of 'n' checks. IMDS is the last in the chain. By configuring to use ImdsCredentialsProvider, Envoy will directly query IMDS for credentials.