add pagination to Pack and Similar lists

[hamirmahal]

Currently, Pack and Similar lists on a sound's page do not show pagination; search results do.

This ticket is to help us track adding pagination to pack and similar lists, just like we did for search results.

[amilajack]

@hamirmahal I removed the needs-design label since your prototype implements what the design would have been haha

[hamirmahal]

@amilajack All good! I'm excited to be working on this.