PPR - Ability to expand and collapse Serial Collateral in registrations

**Is your feature request related to a problem? Please describe the problem & source of request.**
Suggestion from Sharon via email:

May I request that we develop ability to (+-) expand and collapse serialized collateral within the registration. Where there are long lists of serialized collateral- there is much scrolling involved to get the rest of the registration (like General Collateral or to verify).

I might suggest that it keep the first 3 or so showing and then an obvious place to expand when there is more than that listed and/or collapse the list.

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No file, test, or entry point is named in the issue. Start by locating the registration view that renders serialized collateral and review how long lists are currently displayed. Done means users can expand and collapse the list, with the first few items visible by default when the list is long, without obstructing the rest of the registration.

Written by the indexing model from the issue text.