Update directory structure and package name

[kalaiyarasiganeshalingam]

Purpose

$Subject

Related issue: 1623

Examples

Checklist

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

[ThisaruGuruge]

Stdlib module versions should be updated from the version bump PR, and then the group IDs should be updated in the build.gradle file.

[codecov]

Codecov Report

Merging #230 (0a4956d) into master (86e8133) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #230   +/-   ##
=========================================
  Coverage     80.66%   80.66%           
  Complexity       79       79           
=========================================
  Files             6        6           
  Lines           450      450           
  Branches         91       91           
=========================================
  Hits            363      363           
  Misses           62       62           
  Partials         25       25           

Impacted Files	Coverage Δ
ballerina/cache.bal	100.00% <ø> (ø)
ballerina/cache_errors.bal	100.00% <ø> (ø)
...va/io/ballerina/stdlib/cache/nativeimpl/Cache.java	95.00% <ø> (ø)
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	70.90% <ø> (ø)
...ativeimpl/concurrentlinkedhashmap/LinkedDeque.java	89.79% <ø> (ø)
...e/nativeimpl/concurrentlinkedhashmap/Weighers.java	100.00% <ø> (ø)

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