[2201.7.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 81.65%. Comparing base (82329c0) to head (e289663).
Report is 6 commits behind head on 2201.7.x.

Additional details and impacted files

@@              Coverage Diff               @@
##             2201.7.x    #2240      +/-   ##
==============================================
- Coverage       81.71%   81.65%   -0.06%     
  Complexity        577      577              
==============================================
  Files             393      393              
  Lines           21430    21442      +12     
  Branches         4809     4811       +2     
==============================================
- Hits            17511    17509       -2     
- Misses           2917     2928      +11     
- Partials         1002     1005       +3     

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