Update directory structure and package names

[Maninda]

Purpose

$subject related to ballerina-platform/ballerina-library#1623

Checklist

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

[codecov]

Codecov Report

Merging #235 (6341fda) into master (b879736) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #235   +/-   ##
=========================================
  Coverage     80.85%   80.85%           
  Complexity      150      150           
=========================================
  Files            22       22           
  Lines          1029     1029           
  Branches        213      213           
=========================================
  Hits            832      832           
  Misses          109      109           
  Partials         88       88           

Impacted Files	Coverage Δ
ballerina/commons.bal	100.00% <ø> (ø)
ballerina/imap_client_endpoint.bal	100.00% <ø> (ø)
ballerina/imap_listener_endpoint.bal	86.95% <ø> (ø)
ballerina/init.bal	100.00% <ø> (ø)
ballerina/pop_client_endpoint.bal	100.00% <ø> (ø)
ballerina/pop_listener_endpoint.bal	88.00% <ø> (ø)
ballerina/smtp_client_endpoint.bal	96.00% <ø> (ø)
.../ballerina/stdlib/email/server/EmailConnector.java	55.55% <ø> (ø)
...a/stdlib/email/server/EmailConnectorException.java	0.00% <ø> (ø)
...ina/stdlib/email/server/EmailConnectorFactory.java	100.00% <ø> (ø)
... and 12 more

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