Add the getMealRequests query in the backend

[ColinToft]

Notion Ticket Link

Replace with Ticket URL

Implementation Description

• Adds admin query to get all meal requests

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 added tests for my changes
• 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

[shahanneda]

Looks good to me, thanks for doing this one Colin!

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Exception: user_id 65d148dc63c7f0f34ae10fd5 not found app.services.implementations.user_service in ge... View Issue
• ‼️ Exception: The info.involved_meal_requests is negative app.resources.meal_request_dto in __init__ View Issue

_{Did you find this useful? React with a 👍 or 👎}