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 #316 (be55c8e) into master (b8473d6) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #316   +/-   ##
=========================================
  Coverage     84.89%   84.89%           
  Complexity       84       84           
=========================================
  Files            17       17           
  Lines           768      768           
  Branches        108      108           
=========================================
  Hits            652      652           
  Misses           92       92           
  Partials         24       24           

Impacted Files	Coverage Δ
ballerina/byte_stream.bal	89.47% <ø> (ø)
ballerina/client_endpoint.bal	95.00% <ø> (ø)
ballerina/commons.bal	100.00% <ø> (ø)
ballerina/external_functions.bal	85.71% <ø> (ø)
ballerina/file_event.bal	100.00% <ø> (ø)
ballerina/init.bal	100.00% <ø> (ø)
ballerina/listener_endpoint.bal	88.88% <ø> (ø)
...java/io/ballerina/stdlib/ftp/client/FtpClient.java	83.12% <ø> (ø)
...o/ballerina/stdlib/ftp/client/FtpClientHelper.java	82.95% <ø> (ø)
...ballerina/stdlib/ftp/client/FtpClientListener.java	100.00% <ø> (ø)
... and 7 more

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[niveathika]

@Maninda @ThisaruGuruge Seems FTP is still published under 'org.ballerinalang' group id

https://github.com/orgs/ballerina-platform/packages?repo_name=module-ballerina-ftp

https://github.com/ballerina-platform/module-ballerina-ftp/blob/master/build.gradle#L50 This line seems to be the issue

[ThisaruGuruge]

@Maninda @ThisaruGuruge Seems FTP is still published under 'org.ballerinalang' group id

https://github.com/orgs/ballerina-platform/packages?repo_name=module-ballerina-ftp

https://github.com/ballerina-platform/module-ballerina-ftp/blob/master/build.gradle#L50 This line seems to be the issue

I was under the impression that it is already using project.gradle variable here.