Develop class for metrics collection in worker node

[AndrewGavril]

Current worker implementation: #4
Class should be integrated into this code.

Requirements for metrics support:

1. RAM usage by program every second
2. CPU load every second
3. Request processing time

[jcdkiki]

@AndrewGavril Should i checkout from #4 or from main?

[AndrewGavril]

@AndrewGavril Should i checkout from #4 or from main?

Yes, you should inherit all changes from #4