broke "User" into three distinct roles

[harishan-r]

Notion ticket link

User Roles

Implementation description

• changed all occurrences of "User" to the three new User types.
• Ensured that it is still storing a new user in users table*

Steps to test

1. create a new user
2. verify that it is in the user table with the "facilitator" role instead of "user" role

What should reviewers focus on?

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR
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[carolynzhang18]

LGTM!! 🔥🔥

[shanccui]

looks good :)