debugger: improve code quality and prepare PoC to integrate it with templates

[kamilsk]

Motivation: debugger allows to connect with a CLI tool while running and helps investigate deadlocks and problems.

Integrations

• https://github.com/octomation/go-tool
• https://github.com/octomation/go-service

To do

• create an issue in https://github.com/octomation/go-tool/issues
• create an issue in https://github.com/octomation/go-service

see Delayed project.