Auth Configuration is missing from WebSubHub PublisherClient configuration

[ayeshLK]

Description:

• websubhub:Service could be secured with authentication. So, the developer should be able to provide authentication-config to the websubhub:PublisherClient configuration.

Samples

• With authentication-config the websubhub:PublisherClient initialization should look like follows.

    websubhub:PublisherClient publsherClient = check new("https://localhost:9090/websubhub",
        auth = {
            username: "ballerina",
            issuer: "wso2",
            audience: ["ballerina", "ballerina.org", "ballerina.io"],
            keyId: "KEY_ID",
            jwtId: "JWT_ID",
            customClaims: { "scp": "hello" },
            expTime: 3600,
            signatureConfig: {
                config: {
                    keyFile: "../resources/private.key"
                }
            }
        },
        secureSocket = {
            cert: "../resources/public.crt"
        }
    );

Affected Versions:

• Ballerina SL Alpha5

OS, DB, other environment details and versions:

• Ubuntu 20.04