[web] Create a function that fetches messages in batches

Summary:
The function uses limit and offset to get a batch of messages.

https://linear.app/comm/issue/ENG-8705/create-a-function-that-fetches-more-messages-and-dispatches-the-new

Depends on D13138

Test Plan: Tests.

Reviewers: kamil, inka

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13140