feat(render): data-text-format attribute for each html-to-text format

[HasanQQ]

I know render utility has a htmlToTextOptions (docs) option but the preview server uses default settings (from here). I want to use the dataTable format and also want to see the it's output on the preview server; someone else might want to see a different format. So I added selectors for each format supported on the html-to-text docs (formatters).

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Summary by cubic

Adds support for a data-text-format attribute that maps to every html-to-text formatter, letting you control plain-text conversion per element and see the exact output in the preview server. Defaults stay the same and this is opt-in.

• New Features
  • Use data-text-format="{formatter}" on any element to apply a specific formatter (covers all predefined formatters like dataTable, table, heading, etc.).
  • Works in preview and production render; no breaking changes.

^{Written for commit 9bc07bf. Summary will update on new commits.}

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