[2201.8.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 81.75%. Comparing base (3a1c27a) to head (dae3954).
Report is 7 commits behind head on 2201.8.x.

Additional details and impacted files

@@              Coverage Diff               @@
##             2201.8.x    #2241      +/-   ##
==============================================
- Coverage       81.76%   81.75%   -0.01%     
  Complexity        562      562              
==============================================
  Files             393      393              
  Lines           21522    21534      +12     
  Branches         4810     4812       +2     
==============================================
+ Hits            17597    17605       +8     
- Misses           2929     2938       +9     
+ Partials          996      991       -5     

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