[w3c/editing] Behavior of insert* commands for contenteditable=plaintext-only (Issue #419)

See https://bugzilla.mozilla.org/show_bug.cgi?id=1291467#c17 by @masayuki-nakano 

> I checked the behavior in Chrome roughly now, then, I see only the following commands work, so their definitions are required:
>
>   - Handling steps of `Document.execCommand("insertParagraph")` (Chrome/Safari handle this command differently from pressing Enter)
>   - Handling steps of `Document.execCommand("insertLineBreak")` (LF vs `<br>` (Chrome vs. Safari)
>   - Handling steps of the commands when caret is in special elements such as `<li>`
>   - Handling steps of `Document.execCommand("insertText")` (including line breaks causes insertParagraph in both, but I'm not sure it's intended since the behavior looks odd)
>   - Handling steps of `Document.execCommand("insertHTML")` (especially which elements need to be handled as line breaks)
>
> And the other commands (except `undo`, `redo` and clipboard commands) should be defined as NOOP (including not deleting `Selection`).

cc @howard-e 

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