Add Rust backend with auth routes

[chrisgzf]

In preparation for our future reviews system that makes use of our own database (so that we can get rid of Disqus - they have been injecting ads into our site, bleh), this is a bootstrapped new 🦀Rust🦀 backend.

What's done:

• NUS auth
  • to test, after running backend, visit: http://localhost:3000/v1/auth/login?callback=http://localhost:3000/v1/auth/user
• Setting up of routes

What's next:

• Setting up of the DB (I'm still deciding between Postgres or Clickhouse)
• Migrating disqus comments to the DB
• GET api/v1/reviews/:course_id -> Vec<Reviews>
• POST api/v1/reviews/:course_id: should create review
• PUT api/v1/reviews/:course_id/:review_id: should edit review
• DELETE api/v1/reviews/:course_id/:review_id: should delete review

🦀🦀🦀

[vercel]

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Name	Status	Preview	Updated (UTC)
nusmods-export	✅ Ready (Inspect)	Visit Preview	Dec 17, 2023 5:24pm
nusmods-website	✅ Ready (Inspect)	Visit Preview	Dec 17, 2023 5:24pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (17c4bc3) 53.24% compared to head (ee789f6) 53.24%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3645   +/-   ##
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  Coverage   53.24%   53.24%           
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  Files         271      271           
  Lines        5862     5862           
  Branches     1396     1396           
=======================================
  Hits         3121     3121           
  Misses       2741     2741           

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