Expose `PartialInlineContentElement` publicly

[ClementEXWiki]

Is your feature request related to a problem? Please describe. I currently have a function that accepts any valid PartialInlineContent. With a recent update, that type was renamed as PartialInlineContentElement and the new PartialInlineContent is defined differently.

I'd like to have the old behavior back, and writing Exclude<PartialInlineContentElement[number], string> is not really an elegant solution, nor is it risk-free if that type changes too.

Describe the solution you'd like Make PartialInlineContentElement public.

Describe alternatives you've considered N/A

Additional context N/A