[WIP] feat: html support (#4753)

* feat: html support

* fix: support empty lines between children

* refactor: isScriptTagNode util

* refactor: rename `glimmer` and `handlebars` tests

* fix don't add newline after `directive` node

* fix: support `pre` tag

* fix: don't trim comments content

* fix: `script` and `style` tags output

* feat: indent `head` and `body` inside `html`

* fix: better handle quotes around attribute value

* feat: better handle embed

* tests: svg into html

* fix: better handle boolean and empty attributes

* chore(deps): update `parse5` to latest version

* fix: better handle empty attribute

* tests: fix

* fix: extra newline in multiline node

* fix: print `pre` and `textarea` in right way

* tests: xhtml doctype

* fix: use `>` instead `/>`

* tests: case

* refactor: remove `toLowerCase()`

* feat: support `prettier-ignore`

* tests: empty `script` and `style` tags

* fix: clean

* tests: refactor and more

tests/html_comments/for_debugging.html

@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+  <body>
+
+<!-- Do not display this at the moment
+<img border="0" src="pic_trulli.jpg" alt="Trulli">
+-->
+
+  <!-- Do not display this at the moment
+  <img border="0" src="pic_trulli.jpg" alt="Trulli">
+  -->
+
+    <!-- Do not display this at the moment
+    <img border="0" src="pic_trulli.jpg" alt="Trulli">
+    -->
+
+  </body>
+</html>