Add Support Annotation for Column Mapping proposal

[niveathika]

Purpose

$subject

Part of ballerina-platform/ballerina-library#2652

Examples

N/A

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #506 (f22e1b1) into master (d7e6e36) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #506   +/-   ##
=======================================
  Coverage   80.26%   80.26%           
=======================================
  Files          37       37           
  Lines        3567     3567           
  Branches      746      746           
=======================================
  Hits         2863     2863           
  Misses        481      481           
  Partials      223      223           

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