Remove dependency on DHCP handler interface:

[jacobweinstock]

Description

The DHCP handler interface has a method we don't need and didn't need to be a dependency of this package. Also, did some code reorganization and added some code comments.

Why is this needed

Fixes: #

How Has This Been Tested?

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 15 lines in your changes missing coverage. Please review.

Project coverage is 50%. Comparing base (543920a) to head (0abe379).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/iso/iso.go	25%	14 Missing and 1 partial ⚠️

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #557   +/-   ##
===================================
- Coverage    50%    50%   -1%     
===================================
  Files        27     27           
  Lines      2975   2976    +1     
===================================
- Hits       1502   1500    -2     
- Misses     1421   1423    +2     
- Partials     52     53    +1     

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