Jonas Jenwald 2393443e73 Include the /Order array, if available, when parsing the Optional Content configuration
The `/Order` array is used to improve the display of Optional Content groups in PDF viewers, and it allows a PDF document to e.g. specify that Optional Content groups should be displayed as a (collapsable) tree-structure rather than as just a list.

Note that not all available Optional Content groups must be present in the `/Order` array, and PDF viewers will often (by default) hide those toggles in the UI.
To allow us to improve the UX around toggling of Optional Content groups, in the default viewer, these hidden-by-default groups are thus appended to the parsed `/Order` array under a *custom* nesting level (with `name == null`).

Finally, the patch also slightly tweaks an `OptionalContentConfig` related JSDoc-comment in the API.
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