Firebase Auth Middleware

[SaazM]

Resolves #3

Added Firebase auth validator that checks if a valid token is in request header and either:
a) Retrieves user from firebase and adds it to request body if valid token is in the header.
b) Throws an error

To do this I also created the firebase initialization in utils.

Note - Now requires updated .env with service key, I will upload this to the google drive

Tested it by creating a token using the test user in the firebase auth using a python script I made(not in the push)

Example of successful token:

Example of invalid token:

Example of Token not in header:

[mraysu]

LGTM 🎉

[westonz7042]

lgtm