Use a token to authentificate to SaagieAPI

[Qiwei08]

Use a token to authenficate to SaagieAPI.

Contexte:
From an app, we can get a cokkie that contains a token of Saagie. If we can use directly this token to use SaagieAPI, it would be good

[saagie-service]

Trello card: [#207] Use a token to authentificate to SaagieAPI