Fix issues identified in SL Alpha3 Release

[ayeshLK]

Purpose

$subject

Approach

• Add support for x-www-form-urlencoded content delivery with websubhub:HubClient.
• Fix websubhub module related documentation issues.
• Refactor code-base according to latest guidelines.

Samples

Usage of websubhub:HubClient to deliver x-www-form-urlencoded content is as follows.

websubhub:Subscription subscriptionMsg = {
    hub: "https://hub.com", 
    hubMode: "subscribe", 
    hubCallback: "https://sample.subscriber/callback", 
    hubTopic: "https://topic.com", 
    hubSecret: "secretkey1"
};

websubhub:HubClient hubClientEp = check new(subscriptionMsg);

map<string> publishedContent = {
    "query1": "value1",
    "query2": "value2"
};

websubhub:ContentDistributionMessage msg = {
    contentType: "application/x-www-form-urlencoded",
    content: publishedContent
};
var publishResponse = hubClientEp->notifyContentDistribution(msg);

Fixes #1107
Fixes #2033
Fixes #2035

[codecov]

Codecov Report

Merging #75 (fc690c5) into main (663c2da) will increase coverage by 1.15%.
The diff coverage is 83.87%.

@@             Coverage Diff              @@
##               main      #75      +/-   ##
============================================
+ Coverage     74.45%   75.61%   +1.15%     
- Complexity      178      186       +8     
============================================
  Files            10       10              
  Lines           740      771      +31     
  Branches        384      397      +13     
============================================
+ Hits            551      583      +32     
+ Misses          189      188       -1     

Impacted Files	Coverage Δ	Complexity Δ
websubhub-ballerina/hub_listener.bal	85.29% <ø> (+4.21%)	0.00 <0.00> (ø)
websubhub-ballerina/http_service.bal	69.85% <20.00%> (+0.78%)	1.00 <0.00> (ø)
websubhub-ballerina/hub_client.bal	85.82% <88.33%> (+0.38%)	36.00 <25.00> (+5.00)
websubhub-ballerina/commons.bal	84.09% <100.00%> (+2.03%)	3.00 <0.00> (ø)
websubhub-ballerina/publisher_client.bal	78.41% <100.00%> (-0.16%)	12.00 <4.00> (ø)
websubhub-ballerina/utils.bal	69.16% <100.00%> (+1.20%)	77.00 <4.00> (+3.00)

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