Feature Request: public and private key generator

[nptri]

Hi Gatling team,
In modern website log-in APIs this type of data is a must-have, so I come up with this ticket.
Take a look at an example JWK:

jwk = [
    kty: "OKP",
    crv: "Ed25519",
    x: publicKeyBase64,
    d: privateKeyBase64,
    alg: "EdDSA",
    use: "sig"
]

x and d are required to be passed into log-in request, and it is a base64 encoded key, so a little function add-in may help us save lots of time instead of writing a new session function for base64 encode.
Some suggesting algorithms and curve:

Algorithms: EdDSA, RSA, DSA...
Curve: X25519, ECC...

Thanks for reading.