Migrate kafkahub codebase to use the latest Kafka API

[ayeshLK]

Purpose

$subject

[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

[ayeshLK]

Closing this PR as the required changes have been done with this PR [1]

[1] - #1097

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 89.12%. Comparing base (2f02a11) to head (8d2c4f9).

Files with missing lines	Patch %	Lines
ballerina/hub_client.bal	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1096   +/-   ##
=========================================
  Coverage     89.12%   89.12%           
  Complexity       46       46           
=========================================
  Files            16       16           
  Lines           846      846           
  Branches        233      233           
=========================================
  Hits            754      754           
  Misses           88       88           
  Partials          4        4           

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