Improve listener to wait for debezium engine completion

[niveathika]

Purpose

Fixes:

Examples

Checklist

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

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 55.02%. Comparing base (8dedc63) to head (7528a58).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/src/main/java/io/ballerina/lib/cdc/Listener.java	0.00%	20 Missing ⚠️

❌ Your project status has failed because the head coverage (55.02%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #9      +/-   ##
============================================
- Coverage     55.24%   55.02%   -0.23%     
  Complexity      169      169              
============================================
  Files            32       32              
  Lines           972      976       +4     
  Branches        184      183       -1     
============================================
  Hits            537      537              
- Misses          395      399       +4     
  Partials         40       40              

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[TharmiganK]

LGTM