Add debugger interface to allow extracting the workerStats from Worker

[ketsiambaku]

What changed?
This PR adds a debugger interface to the debug package

Why?
Currently the WorkerStats struct is injected in the client by passing it as a worker options however there is no way of retrieving the WorkerStats or its fields from a Worker instance unless we keep track of Trackers instances that were constructed and passed as options seperately. In this PR, we make improvement to the design by adding a debugger interface. The internal worker implementation implements Debugger and allow consumers to retrieve the WorkerStats

How did you test it?
Unit tests
Local Test

Potential risks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.50%. Comparing base (ed58224) to head (d3de151).
Report is 2 commits behind head on master.

Additional details and impacted files

Files with missing lines	Coverage Δ
internal/internal_worker.go	80.49% <100.00%> (+0.16%)	⬆️

... and 2 files with indirect coverage changes

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[dkrotx]

Good approach!