Add request/response logic for fetching a list of students.

Bug: b:343731449
Change-Id: I5895d36691cf99f1c041ff8051dee40c33f598b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5608973


Reviewed-by: April Zhou <aprilzhou@google.com>
Commit-Queue: Tali Gorokhovsky <taligoro@google.com>
Reviewed-by: Artsiom Mitrokhin <amitrokhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313039}