✨ Add support for signing JWTs with asymmetric keys

[maacpiash]

Using asymmetric keys to sign JWTs would strengthen the overall security and integrity of our system. In this model, our system would generate private-public key-pairs, as many as needed. Then, the JWTs would be signed using a private key and can be verified using the corresponding public key.

We plan to use NetDevPack/Security.Identity for this purpose.

This task consists of two sub-tasks:

• Configure the DI container and the TokenGenerator to generate key-pairs and use private keys for signing.
• Expose a ReST endpoint for the JWKS, i.e. the public keys.