Update Directory Structure and Artifact Group Names

[ayeshLK]

Purpose

$Subject

Related issue: #1623

Examples

N/A

Checklist

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

[codecov]

Codecov Report

Merging #314 (3f1fb49) into master (f6cab31) will decrease coverage by 0.16%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #314      +/-   ##
============================================
- Coverage     86.63%   86.46%   -0.17%     
- Complexity        0       17      +17     
============================================
  Files            10       13       +3     
  Lines           546      591      +45     
  Branches        306      309       +3     
============================================
+ Hits            473      511      +38     
- Misses           73       79       +6     
- Partials          0        1       +1     

Impacted Files	Coverage Δ
ballerina/annotation.bal	66.66% <ø> (ø)
ballerina/commons.bal	100.00% <ø> (ø)
ballerina/http_service.bal	85.71% <ø> (ø)
ballerina/init.bal	100.00% <ø> (ø)
ballerina/native.bal	100.00% <ø> (ø)
ballerina/request_processor.bal	90.00% <ø> (ø)
ballerina/resource_discovery.bal	78.78% <ø> (ø)
ballerina/sub_listener.bal	84.50% <ø> (ø)
ballerina/subscriber_client.bal	85.18% <ø> (ø)
ballerina/utils.bal	89.07% <ø> (ø)
... and 6 more

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