feat: implement agent events for basic messages

Description

Basic didcomm message implemetation:

• with the full ocm infra:

  1.1 Sender OCM will submit the message over the gateway

  1.2 Sender OCM will push event over websocket that the message has been sent.

  1.3 Receiver OCM will receive AFJ event

  1.4 Receiver OCM will push the event to gateway and to websocket as a response

• agent Rest api 1.1 Agent rest api matches the gateway api

  1.2 When the Sender Agent submit a request a response will be returned

  1.3 Receiver Agent will receive AFJ event

  1.4 Receiver Agent will log the message for debugging purposes. Further implementation of a webhook or other notification channel can be added after discussion.

Related issues

No related issues.

Testing

Checklist

• I have updated the documentation (if necessary)
• I have added unit tests for new functionality (if applicable)
• My code follows the style guidelines of this project
• I have tested this code on my local machine before submitting this MR

Reviewers

@boyan.tsolov FYI

Additional Notes

[Add any additional notes or comments you have about this merge request.]

Closes #12 (closed)