Init firebase emulator (#191)

[xpbowler]

Notion ticket link

Initialize Firebase Local Emulator Suite

Implementation description

• Added a flag called firebase-emulator that starts up the firebase emulator services (auth, firestore, storage)
• TODO: replace my personal firebase account token with UW Blueprint's

Steps to test

1. docker-compose --profile firebase-emulator up --build
2. View emulator UI suite at localhost:5003
3. To generate firebase private token for repo, firebase login:ci (assuming logged into firebase project with firebase-cli)

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