Fix #119: Fetch and archive google json web keys set pair

[sukhman-sukh]

This PR introduces a model to store JSON Web Key Sets (JWK Sets) and X.509 certificates, along with a timestamp indicating the last update.

It also exposes two API endpoints for managing the key sets:

1. GET /api/key/fetchJwkSet

• Retrieves all archived keys stored in the database.

2. POST /api/key/updateJwkSet

• Updates the timestamp for an existing key if it already exists in the database. If the key is new (rotated), it will be inserted into the database along with the latest timestamp.

[Divide-By-0]

How do these display in the front end when I search? And is the timestamp getting passed to witness?

[sukhman-sukh]

Sure,
I will add a page in frontend to view the archived JWK set and certs similar to DKIM archive

[Divide-By-0]

Please fork a branch on main repo and make a new PR, as it will then deploy a preview for that. Please also add the frontend features at the same time as this PR, as well as a test!

[Divide-By-0]

The more important part of this issue is that we need to update keys every 5 minutes or so, so a cronjob script is a critical part of the backend deployment here.