symbol name refactoring

[kwitsch]

First step for #1260

each commit renames one type or function

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (d52c598) 93.76% compared to head (36a7a9d) 93.87%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
util/edns0.go	95.89%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1263      +/-   ##
==========================================
+ Coverage   93.76%   93.87%   +0.10%     
==========================================
  Files          72       75       +3     
  Lines        5890     6041     +151     
==========================================
+ Hits         5523     5671     +148     
- Misses        284      286       +2     
- Partials       83       84       +1     

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