Avoid double-marshal'ing strings (uint byte arrays)

[phillip-stephens]

Closes #463
Since strings are represented as uint8 arrays, we were double-marshal'ing the string here. This caused the bug seen where when you decoded the base-64 encoded string, you got another base-64 encoded string in quotes.

Testing

$ echo defo.ie | ./zdns HTTPS --name-servers 8.8.8.8                                                                                         

{"name":"defo.ie","results":{"HTTPS":{"data":{"additionals":[{"flags":"","type":"EDNS0","udpsize":512,"version":0}],"answers":[{"class":"IN","name":"defo.ie","priority":1,"svcparams":{"ech":"AED+DQA8awAgACD/2gZ+zTEEWYcDbLHxYEmDqk8SJPcAu2p3EOCdkPQMdAAEAAEAAQANY292ZXIuZGVmby5pZQAA","ipv4hint":["213.108.108.101"],"ipv6hint":["2a00:c6c0:0:116:5::10"]},"target":".","ttl":1800,"type":"HTTPS"}],"protocol":"udp","resolver":"8.8.8.8:53"},"duration":0.297062125,"status":"NOERROR","timestamp":"2024-11-01T13:13:11-04:00"}}}

$ echo "AED+DQA8awAgACD/2gZ+zTEEWYcDbLHxYEmDqk8SJPcAu2p3EOCdkPQMdAAEAAEAAQANY292ZXIuZGVmby5pZQAA" | base64 -d
<k  ��~�1Y�l��`I��O$��jw����
cover.defo.ie%   

This also fixes where we were base-64 encoding many strings when printing the TLS handshake

~/zdns on  main! ⌚ 13:25:38
$ echo "cloudflare.com" | ./zdns A --threads=2 --https --verify-server-cert --root-cas-file="/Users/phillip/Desktop/macos-root-certs.pem"  | grep -o -E '.{0,5}:\"I.{0,5}' | wc -l
      80 # 80 strings were doubly base-64 encoded

~/zdns on  phillip/463-double-encode-bug! ⌚ 13:25:50
$ echo "cloudflare.com" | ./zdns A --threads=2 --https --verify-server-cert --root-cas-file="/Users/phillip/Desktop/macos-root-certs.pem"  | grep -o -E '.{0,5}:\"I.{0,5}' | wc -l
       2


$ echo "cloudflare.com" | ./zdns A --threads=2 --https --verify-server-cert --root-cas-file="/Users/phillip/Desktop/macos-root-certs.pem"  | grep -o -E '.{0,5}:\"I.{0,5}'
lass":"IN","n
lass":"IN","n