📝 Provide a description of the new feature

The ClipboardPipeline is performing some HTML normalization (on string) just before converting it to the view document fragment:

• There is no easy extension point to add additional normalizers.
• The PasteFromOffice is ignoring the prepared view document fragment and is performing a separate normalization on the data transfer payload:
  

  ckeditor5/packages/ckeditor5-paste-from-office/src/pastefromoffice.ts

  Line 83 in d874050

  const htmlString = data.dataTransfer.getData( 'text/html' );

  
  

  ckeditor5/packages/ckeditor5-paste-from-office/src/pastefromoffice.ts

  Line 88 in d874050

  data._parsedData = parseHtml( htmlString, viewDocument.stylesProcessor );

Those cases could be unified as an extension point in the ClipboardPipeline so non-parsed data could be processed before conversion to the view document fragment.

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