AWS v4 auth for http client components

[jfrconley]

Added support for configuring aws_v4 authentication http client components. This is useful in cases where you want to call a lambda function url or protected api gateway using the included aws auth capabilities.

Example:

pipeline:
  processors:
    - http:
         url: "https://some-lamba-function-url"
         verb: "GET"
         aws_v4:
           // Will try to pull credentials from the environment by default
           enabled: true
           // You can configure the service name as needed
           service: test-service
           
           // These fields are the exact same as other resources that use v4 auth
           region: us-east-1
           credentials:
             profile: test-profile