refactor: listeners should be moved to apps OP#245

Description

https://plan.vereign.com/projects/vbd/work_packages/245

Current: Listeners for proof requests and Connections are in the aksar library.

Desired: The current behaviour is very limiting when we create different applications and need different listeners, as we need to add a lot of env vars to include and exclude a behaviour. If we move this to apps this complexity will be moved from the askar library to apps.

Related issues

https://plan.vereign.com/projects/vbd/work_packages/245

Testing

[Describe any testing you've done on this code. What tests have you run, and what were the results?]

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

@zdravko.iliev @boyan.tsolov