correctly support CNAMEs

[BeryJu]

closes #611

Also query for CNAME records when querying, and if any CNAME records are found, gravity will look those up too and return those too. The limit is hardcoded to 10 levels deep, which is more than should realistically be needed

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (35fe023) 57.77% compared to head (43bf48c) 57.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #794      +/-   ##
==========================================
- Coverage   57.77%   57.75%   -0.03%     
==========================================
  Files          90       90              
  Lines        4587     4587              
==========================================
- Hits         2650     2649       -1     
- Misses       1673     1674       +1     
  Partials      264      264              

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