add nuclei id attribute to tasks

[dxenes1]

now that we have the nuclei view, we should have a way in the app to grab nuclei IDs for seg IDs that have them.

This wouldn't necessarily be a new attribute for a task though, could be part of task metadata or just something that is dynamically queried.

Potential solution:
Adapt nuclei viewer such that instead of querying the nuclei table through cave, it just uses a local cache file that is stored in static. If the static file is more than a day old, it is regenerated upon query.

nuclei viewer should accept both root IDs and nuclei IDs. if a root ID is inputted, the corresponding nuclei ID is found from the cached table and displayed.