[test-client] Include endpoint as additional audience

[rkistner]

A self-hosted setup often uses powersync-dev as the audience, instead of the endpoint URL. This updates the generate-token script to include the endpoint URL as an additional audience. This defaults to http://127.0.0.1:<port>. but can be customized.

This also increases the token expiry from 1h to 24h.

Combined with powersync-ja/powersync-js#264, this helps streamline usage of the diagnostics app for local development.

Sample:

pnpm generate-token -c ../service/powersync.yaml 

> [email protected] generate-token /home/ralf/src/powersync-service/test-client
> tsc -b && node dist/bin.js generate-token "-c" "../service/powersync.yaml"

Payload:
{
  "sub": "test_user",
  "iat": 1723548362,
  "iss": "test-client",
  "aud": [
    "powersync-dev",
    "http://127.0.0.1:8080"
  ],
  "exp": 1723634762
}
Token:
eyJhbGciOiJIUzI1NiIsImtpZCI6InBvd2Vyc3luYy1kZXYifQ.e...

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