Ability to disable "Special Use Domain Name" blocking

[mapl]

https://0xerr0r.github.io/blocky/latest/configuration/#special-use-domain-names

setting enable to false of specialUseDomains will unblock all Special Use Domain Names

specialUseDomains:
  enable: false

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.12%. Comparing base (fe84ab8) to head (81cbd63).
Report is 141 commits behind head on main.

Files with missing lines	Patch %	Lines
resolver/sudn_resolver.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1614      +/-   ##
==========================================
+ Coverage   93.88%   94.12%   +0.23%     
==========================================
  Files          78       80       +2     
  Lines        6361     5052    -1309     
==========================================
- Hits         5972     4755    -1217     
+ Misses        300      213      -87     
+ Partials       89       84       -5     

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[ThinkChaos]

Thanks for making the change!

We'd also need to update the docs (docs/configuration.md and docs/config.yml).
And ideally add basic a test for IsEnabled (see Describe("IsEnabled", ...) in config/redis_test.go for an example).
If that's too much bother, let me know and I can do it.

Can you also explain a bit about your use case?

[mapl]

I would love to see you making the subsequent changes to the docs and test if you like
The use case is a dns migration where I successfully used blocky in the past to forward any dns query to the destination dns server. I really liked the exposed Prometheus metrics to track the remaining dns clients.