bug/preserve light dom html entities in text nodes

[thescientist13]

Related Issue

ProjectEvergreen/greenwood#1375

Summary of Changes

1. Naive implementation for preserving HTML entities in text nodes
2. Add test case

TODO

1. Should we handle > too? Others?
2. Would this not "mangle" legitimate uses of < too?

---

Regarding the second point above, it seems through the serialization process parse5 will even encode legitimate < even when not using our replace function? 🤔

{
  value: '\n' +
    '          <h1>Hello from the server rendered users < page! 👋</h1>\n' +
    '        '
}
{
  html: '\n' +
    '        <x-ctc>\n' +
    '          <h1>Hello from the server rendered users &lt; page! 👋</h1>\n' +
    '        </x-ctc>\n' +
    '        '
}

[thescientist13]

confirmed that #178 seems to fix this issue completely as confirmed in ProjectEvergreen/greenwood#1376 😌