Add auth emulator

[frasermcc9]

Description

Sets up the firebase auth emulator, which allows us to locally use auth services without effecting the prod auth service. Especially useful during tests so the service isn't spammed with random accounts.

Fixes/resolves #123

Should be merged before #94

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

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[fishmonger45]

Everything works fine when I have tried this locally, but my review should be cheapened my inexperience with this. All the new users were tracked in the auth UI fine

[frasermcc9]

Everything works fine when I have tried this locally, but my review should be cheapened my inexperience with this

That probably makes it better since it worked with no extra setup :P

[fishmonger45]

Maybe just add the emulator ui http://localhost:4000/auth to the appropriate readme? Probably not needed given it's a giant banner in stdout

[j-chad]

LGTM

[fishmonger45]

not many eggs left to break.