Call same printChildren as for React in HTMLElement plugin

[pedrottimark]

Summary

Fixes #3825

If highest priority is to accurately serialize HTML rendered by React or other frameworks:

• Do not trim a content space at the beginning of a text node.
• Do not trim a content newline (for example, in pre or textarea elements).
• Do not filter out an empty text node.

For a while, I thought we could “have our cake and eat it too” for static-site HTML by removing newlines followed by even number of spaces with /\n+( {2})*/ pattern, but newline and indentation preceding span in syntax-highlighted pre is a counterexample.

Residue

• serialize SVG elements from this plugin, because React can render them too
• confusing indentation of multiline text node in lib/markup.js especially affecting HTML
• last installment of README.md after Add Usage in Jest to pretty-format/README.md #4253 has been merged

Test plan

Local yarn test has one failure probably related to #4254 [have merged fix from master]

Updated existing tests to call createTextNode method:

• supports an HTML element with attribute and text content
• supports an element with text content
• supports nested elements with attribute and text content

Updated existing tests to specify improved formatting:

• supports non-empty text node
• supports comment node
• supports maxDepth option

Added fail-first tests to specify improved formatting:

• supports empty text node
• supports multiline text node in pre
• supports multiline text node preceding span in pre
• supports multiline text node in textarea element

Added pass-first tests to specify existing formatting:

• supports nested elements with attribute and text content

[github-actions]

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