Function buildMarksTree

buildMarksTree<
    M extends PortableTextMarkDefinition = PortableTextMarkDefinition,
>(
    block: PortableTextBlock<M>,
): (
    | ToolkitTextNode
    | ArbitraryTypedObject
    | ToolkitNestedPortableTextSpan<M>
)[]
Takes a Portable Text block and returns a nested tree of nodes optimized for rendering in HTML-like environments where you want marks/annotations to be nested inside of eachother. For instance, a naive span-by-span rendering might yield:
```
<strong>This block contains </strong>
<strong><a href="https://some.url/">a link</a></strong>
<strong> and some bolded and </strong>
<em><strong>italicized text</strong></em>
```
...whereas an optimal order would be:
```
<strong>
  This block contains <a href="https://some.url/">a link</a>
  and some bolded and <em>italicized text</em>
</strong>
```
Note that since "native" Portable Text spans cannot be nested, this function returns an array of "toolkit specific" types: @text and @span .

The toolkit-specific type can hold both types, as well as any arbitrary inline objects, creating an actual tree.
Type Parameters
- M extends PortableTextMarkDefinition = PortableTextMarkDefinition
Parameters
- block: PortableTextBlock<M>
  The Portable Text block to create a tree of nodes from
Returns (ToolkitTextNode | ArbitraryTypedObject | ToolkitNestedPortableTextSpan<M>)[]
Array of (potentially) nested spans, text nodes and/or arbitrary inline objects