Fix URL encoded form data binding

[TharmiganK]

Purpose

$Subject

Fixes: ballerina-platform/ballerina-library#5068

Examples

import ballerina/http;
import ballerina/io;

service on new http:Listener(9090) {

    resource function post [string... path](map<string> form) returns map<string> {
        return form;
    }
}

$ curl -v "http://localhost:9090/test" -d "key0%261%3D2=value1&key2=value2%26value3%3Dvalue4"
*   Trying 127.0.0.1:9090...
* Connected to localhost (127.0.0.1) port 9090 (#0)
> POST /test HTTP/1.1
> Host: localhost:9090
> User-Agent: curl/8.1.2
> Accept: */*
> Content-Length: 49
> Content-Type: application/x-www-form-urlencoded
> 
< HTTP/1.1 201 Created
< content-type: application/json
< content-length: 52
< server: ballerina
< date: Mon, 23 Oct 2023 08:58:20 +0530
< 
* Connection #0 to host localhost left intact
{"key2":"value2&value3=value4", "key0&1=2":"value1"}

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (c6fa38d) 81.66% compared to head (1a39546) 81.66%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1800   +/-   ##
=========================================
  Coverage     81.66%   81.66%           
  Complexity      562      562           
=========================================
  Files           393      393           
  Lines         21343    21343           
  Branches       4780     4780           
=========================================
+ Hits          17429    17430    +1     
+ Misses         2928     2924    -4     
- Partials        986      989    +3     

Files	Coverage Δ
...ture/converter/UrlEncodedStringToMapConverter.java	61.11% <50.00%> (-2.78%)	⬇️

... and 8 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication