dns: make blocky config fully customizable

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 33.33333% with 18 lines in your changes missing coverage. Please review.

Project coverage is 21.90%. Comparing base (9bc6f9d) to head (f91559a). Report is 2 commits behind head on main.

:x: We are unable to process any of the uploaded JUnit XML files. Please ensure your files are in the right format.

Files with missing lines	Patch %	Lines
pkg/roles/dns/handler_forward_blocky.go	33.33%	14 Missing and 4 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1311 +/- ## ========================================== + Coverage 21.87% 21.90% +0.02% ========================================== Files 232 232 Lines 19864 19907 +43 ========================================== + Hits 4345 4360 +15 - Misses 15068 15096 +28 Partials 451 451 ```

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