Introduce service layer

[ndr-brt]

Feature Request

Currently, the services are located in the api modules, we want to make them available to any port implementation, but at the same time on top of the core modules, to avoid tangles.

Which Areas Would Be Affected?

core

Why Is the Feature Desired?

project structure improvement

Solution Proposal

Type of Issue

improvement

Checklist

• assigned appropriate label?
• Do NOT select a milestone or an assignee!