feat: Normalize all "targethost" and hex-encoded fields - #4944
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Issue
Not all fields are normalized (changed to lowercase) so that future comparisons do not need to be case aware.
This issue was fixed for CNAME in #4940 but other record fields, such as the MX record's Mx, are not normalized.
Tracking which record type fields need to be normalized is a PITA.
Resolution
Create a function
normalizeRDATA()which normalizes fields. The function will be code-generated so that future rtypes will be properly normalized.While we're at it, let's normalize hex data to lowercase instead of uppercase like the rest of the world does.