Include auth-config to websubhub ClientConfiguration

[ayeshLK]

Purpose

$subject

Fixes #1324

Examples

• With auth-config websubhub:PublisherClient could be initialized as 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"
        }
    );

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #131 (5a4f3b7) into main (b894f9e) will increase coverage by 1.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #131      +/-   ##
============================================
+ Coverage     80.75%   81.77%   +1.02%     
  Complexity       14       14              
============================================
  Files            11       11              
  Lines           800      801       +1     
  Branches        436      436              
============================================
+ Hits            646      655       +9     
+ Misses          154      146       -8     

Impacted Files	Coverage Δ	Complexity Δ
websubhub-ballerina/commons.bal	90.00% <100.00%> (+0.16%)	0.00 <0.00> (ø)
websubhub-ballerina/utils.bal	77.50% <0.00%> (+3.33%)	0.00% <0.00%> (ø%)

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