Add support to the `call http` task

[ricardozanini]

What would you like to be added:
Moving forward with the implementation, we need to add the call http task for more compelling demos.

We can use this to verify this work:

• https://github.com/serverlessworkflow/specification/blob/main/ctk/features/call.feature
• https://github.com/serverlessworkflow/specification/blob/main/examples/call-http-endpoint-interpolation-shorthand.yaml
• https://github.com/serverlessworkflow/specification/blob/main/examples/call-http-endpoint-interpolation.yaml
• https://github.com/serverlessworkflow/specification/blob/main/examples/call-http-query-headers-expressions.yaml
• https://github.com/serverlessworkflow/specification/blob/main/examples/call-http-redirect.yaml

Authorization is out of the scope now.