generate tokens for api access

[dreamalligator]

need to generate a token to pass as a param when used in google sheets to access the api.

[dreamalligator]

decent tutorials

• https://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-xxiii-application-programming-interfaces-apis
• https://blog.miguelgrinberg.com/post/json-web-tokens-with-public-key-signatures
• https://realpython.com/token-based-authentication-with-flask/
• https://stackoverflow.com/questions/32510290/how-do-you-implement-token-authentication-in-flask

[dreamalligator]

added token encoding/decoding functions, along with tests.

[dreamalligator]

• [ ] add option to set expiration times in config