Add support for JWT token authentication (e.g. Gitlab)

[vladimir-kotikov]

This is useful mostly for authenticating in Gitlab pipelines but can also me used with any other JWT authentication method

[vladimir-kotikov]

@nymous thanks for your work! Any chance this PR can be reviewed and merged soon?

[nymous]

Hey! Thank you for your contribution! I will try to take a look at it before the end of August, hopefully I can use some of the holidays to my advantage ^^' If I can I will release it before the Pydantic v2 version, as it is useful on its own, I think it will be easier and I hope it won't interfere much with the other PR (I haven't looked at either yet).

[vladimir-kotikov]

Hey, absolutely no worries! I just wanted to remind to make sure this is not abandoned. If you decide to release the other one first, just ping me to resolve any conflicts with this PR.