Update directory structure and package names

[dilanSachi]

Purpose

$title

Examples

N/A

Checklist

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

Related to - ballerina-platform/ballerina-library#1623

[codecov]

Codecov Report

Merging #246 (2536abe) into master (56726fd) will decrease coverage by 0.10%.
The diff coverage is 22.22%.

@@             Coverage Diff              @@
##             master     #246      +/-   ##
============================================
- Coverage     82.17%   82.06%   -0.11%     
  Complexity      232      232              
============================================
  Files            35       35              
  Lines          1464     1461       -3     
  Branches        171      171              
============================================
- Hits           1203     1199       -4     
  Misses          195      195              
- Partials         66       67       +1     

Impacted Files	Coverage Δ
ballerina/caller.bal	100.00% <ø> (ø)
ballerina/consumer.bal	97.43% <ø> (ø)
ballerina/init.bal	100.00% <ø> (ø)
ballerina/kafka_errors.bal	100.00% <ø> (ø)
ballerina/listener.bal	90.90% <ø> (ø)
ballerina/producer.bal	93.75% <ø> (ø)
ballerina/producer_utils.bal	81.81% <ø> (ø)
ballerina/records.bal	100.00% <ø> (ø)
...dlib/kafka/exceptions/KafkaConnectorException.java	50.00% <ø> (ø)
...ballerina/stdlib/kafka/impl/KafkaListenerImpl.java	85.41% <ø> (ø)
... and 27 more

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