Introduce `BlockquoteContent` interface

See https://product-fabric.atlassian.net/wiki/spaces/ADF/pages/3869803228/ADF+Change+72+Node+Nesting.

For most of the new nested types that it introduces, we already have a marker interface abstracting it, so it won’t be difficult to add the marker interface to existing types. For example, ListItem already uses ListItemContent, so adding ListItemContent to DecisionList is pretty trivial. However, there is currently no such marker interface for Blockquote nodes, which gives Paragraph as the content type directly, which means we need to break binary compatibility first before this change will be possible. It’s probably best to do that up front so it won’t get in the way of this later.

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