Split user Member Activity History file to avoid rate limits

[t-will-gillis]

Overview

Posting the "Member Activity History" was partially successful, but we need to split the file into smaller segments to avoid rate limits.

Action Items

• Split "Member Activity History" in to smaller pieces.

Resources/Instructions

[HackforLABot]

Hi @t-will-gillis, thank you for taking up this issue! Hfla appreciates you :)

Do let fellow developers know about your:-
i. Availability: (When are you available to work on the issue/answer questions other programmers might have about your issue?)
ii. ETA: (When do you expect this issue to be completed?)

You're awesome!

P.S. - You may not take up another issue until this issue gets merged (or closed). Thanks again :)