Fix scp for access token

[enadeau]

Fixed the bug caused by 4.1 caused by the fact that the scp field is not defined for non-user token.

Made the scp attribute on user a list of string that defaults to the empty list.

[codecov]

Codecov Report

Merging #133 (38210fc) into main (6de7704) will not change coverage.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files           6        6           
  Lines         243      248    +5     
=======================================
+ Hits          243      248    +5     

Impacted Files	Coverage Δ
fastapi_azure_auth/user.py	100.0% <100.0%> (ø)

[enadeau]

@JonasKs On my side this is ready to go. I went a different way than the one you were suggesting, I used a validator to convert the scopes into a list.

[JonasKs]

Thank you 😊