Support of hashed passwords when installing tljh

[VahagnBleyan]

Proposed change

Hi guys, it will be great to add support of hashed passwords in firstuseauthenticator. It will greatly helps in tljh installation automation process when you need to create jupyterhub with bunch of predefined users and passwords and also this feature will not compromise passwords when you store them in install process.

So for example for password test hashed with sha512sum tljh install will look

curl -L https://tljh.jupyter.org/bootstrap.py | python3 - \
    --admin admin:ee26b0dd4af7e749aa1a8ee3c10ae9923f618980772e473f8819a5d4940e0db27ac185f8a0e1d5f84f88bc887fd67b143732c304cc5fa9ad8e6f57f50028a8ff

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[welcome[bot]]

Thank you for opening your first issue in this project! Engagement like this is essential for open source projects! :hugs:
If you haven't done so already, check out Jupyter's Code of Conduct. Also, please try to follow the issue template as it helps other other community members to contribute more effectively. You can meet the other Jovyans by joining our Discourse forum. There is also an intro thread there where you can stop by and say Hi! :wave:
Welcome to the Jupyter community! :tada:

[manics]

@VahagnBleyan I've transferred this issue to the relevant repo for the firstuseauthenticator.

[VahagnBleyan]

Any news on this? is it possible to do or you all too busy for this ( up up up up

[fafa92]

any updates on this??