feature: add support for electrode-sso

[divyakarippath]

Usage:

For selected routes:

"/": {
    pageTitle: "Welcome to Electrode",
    subApps: ["./home", "./demo1", "./demo2"],
    auth: ["electrode-sso"], // auth strategies decorated in fastify instance
    }
  },

To add SSO for all the routes, set auth as plugin option.

plugins: {
  "subapp-server": {
      enable: true,
      options: {
        auth: ["electrode-sso"]
      }
    },
}

Send To Client By Cookies:

"/": {
    pageTitle: "Welcome to Electrode",
    subApps: ["./home", "./demo1", "./demo2"],
    auth: ["electrode-sso"], // auth strategies decorated in fastify instance
    settings: {
      preHandler: (request, reply, done) => {
        if (request.auth && request.auth.credentials) {
          electrodeCookies.set("SSO_CRED", request.auth.credentials, { request, secure: true });
        }
        done();
      },
    }
  },