More gitlab changes

[ABrain7710]

Description

• Added issue labels and events
• Added merge request labels, labels, events, metadata, commits, and files
• Added logic for merge request reviewers, merge request assignees, and issue assignees but I commented out the insertions because I don't want to insert the data until the logic for contributors is added. Since the assignee or reviewer data without the cntrb_id is super useful unless you wanted to look the user up on gitlab.
• Added logic for message collection. It currently works, but the unique key on the message table doesn't include the platform_id so I am worried that on large instances the msg_ids for github and gitlab would collide. If this doens't get merge right away I'll add the unique key and remove this comment.

Notes: The logic for cntrb_id being added to all these data points is not done yet. That is what I plan to add next. I simply wanted to get the base data for everything first

Signed commits

• Yes, I signed my commits.