[INTF25] Implement Reviewer Authentication

[isabellehuangg]

Notion ticket link

Ticket Name

Implementation description

• Create service function to compare userId (from accessToken) and applicantRecordId to the data in reviewed_applicant_records table to look for a match (returns True if match, False otherwise)

Steps to test

What should reviewers focus on?

• N/A

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