[2201.9.x] Add support for configuring server name to be used in the SSL SNI extension

[TharmiganK]

Purpose

Add support for configuring the server name to be used in the SSL SNI extension.
Related issue: ballerina-platform/ballerina-library#7435

Introduced a new field named serverName in the secureSocket config under ClientConfiguration.

Examples

http:ClientConfiguration clientConf = {
    secureSocket: {
        cert: {
            path: common:TRUSTSTORE_PATH,
            password: "ballerina"
        },
        serverName: "localhost"
    }
};

Checklist

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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.89%. Comparing base (b57690d) to head (de5a8ba).
Report is 6 commits behind head on 2201.9.x.

Additional details and impacted files

@@              Coverage Diff               @@
##             2201.9.x    #2242      +/-   ##
==============================================
- Coverage       80.96%   80.89%   -0.08%     
  Complexity        561      561              
==============================================
  Files             391      391              
  Lines           21647    21659      +12     
  Branches         4994     4996       +2     
==============================================
- Hits            17527    17520       -7     
- Misses           3105     3125      +20     
+ Partials         1015     1014       -1     

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