[TYPES] Refine SearchResponse[] type to reflect properties of Officer, Agency, Unit, Complaint, Litigation

SearchResponse currently looks like this:
```
export type SearchResponse = {
uid: string | number
title: string
subtitle: string
content_type: SearchContentType
source: string
last_updated: string
description?: string
tags?: string[]
first_name?: string
middle_name?: string
last_name?: string
suffix?: string | null
ethnicity?: string
gender?: string
state_ids?: any[] // TODO: replace with subtype
details?: string[]
}
```

It should properly be an Array of SearchContentType (Officer, Agency, Unit, Complaint, Litigation)