Improve support for runtime JSON schema generation

[Thevakumar-Luheerathan]

Purpose

Fixes:ballerina-platform/ballerina-library#8101

Examples

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.15%. Comparing base (ed34fd9) to head (10776c0).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #14   +/-   ##
=======================================
  Coverage   41.15%   41.15%           
=======================================
  Files           3        3           
  Lines         294      294           
  Branches       82       82           
=======================================
  Hits          121      121           
  Misses        173      173           

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