Update directory structure and package names

[ldclakmal]

Purpose

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

Checklist

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

[codecov]

Codecov Report

Merging #249 (7612dc2) into master (0060ced) will decrease coverage by 0.49%.
The diff coverage is 55.55%.

@@             Coverage Diff              @@
##             master     #249      +/-   ##
============================================
- Coverage     81.87%   81.37%   -0.50%     
  Complexity       94       94              
============================================
  Files            17       17              
  Lines           491      494       +3     
  Branches         80       82       +2     
============================================
  Hits            402      402              
- Misses           69       72       +3     
  Partials         20       20              

Impacted Files	Coverage Δ
ballerina/auth_commons.bal	100.00% <ø> (ø)
ballerina/auth_errors.bal	100.00% <ø> (ø)
ballerina/auth_utils.bal	76.92% <ø> (ø)
ballerina/init.bal	100.00% <ø> (ø)
...ain/java/io/ballerina/stdlib/auth/ModuleUtils.java	100.00% <ø> (ø)
...rina/stdlib/auth/ldap/CommonLdapConfiguration.java	87.93% <ø> (ø)
.../ballerina/stdlib/auth/ldap/ConnectionContext.java	96.29% <ø> (ø)
...erina/stdlib/auth/ldap/SslContextTrustManager.java	85.71% <ø> (ø)
.../io/ballerina/stdlib/auth/ldap/SslTrustConfig.java	56.52% <ø> (ø)
...rina/stdlib/auth/ldap/nativeimpl/Authenticate.java	85.71% <ø> (ø)
... and 7 more

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[ThisaruGuruge]

LGTM