Description

added Jackson serializer
renamed/shortened the event name strings
re-organized the folder places of the even handlers
added shared classess for sharing common event handler logic across all event handlers
moved the placement of common shared variable names to a separate shared class
removed the base64 decoding functionality of text data (not needed)
removed toString() methods (not needed, instead of using manual JSON construct, now using Jackson JSON serializer)
added a few SQL statements (more details at the file changes)
added CustomTimeStampSerializer class for serializing timestamp

Checklist

[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[x] My changes generate no new warnings
[ ] I have added manual/automated tests that prove my fix is effective or that my feature works
[ ] New and existing unit tests pass locally with my changes
[x] Any dependent changes have been merged and published in downstream modules