Allow exporting a document fragment from the exportDOM function

[skopz356]

Closes #5238

This PR allows a node's exportDOM function to return a DocumentFragment in addition to a HTMLElement or TextNode, which allows exporting a collection of elements with no wrapping element from that node.

See the linked issue for more details, but my basic use case is being able to remove a wrapping anchor tag from the HTML output if the href property is invalid, but keep any formatting (such as tags) within that anchor tag.

Based on: #5288

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.78 KB (0%)
lexical - esm	29.62 KB (0%)
@lexical/rich-text - cjs	38.21 KB (0%)
@lexical/rich-text - esm	31.51 KB (0%)
@lexical/plain-text - cjs	36.87 KB (0%)
@lexical/plain-text - esm	28.82 KB (0%)
@lexical/react - cjs	40.01 KB (0%)
@lexical/react - esm	32.91 KB (0%)

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[etrepum]

Looks good and tests are passing!