Merge pull request Netflix#3024 from Netflix/client_requesthandler

Introducing RequestHandler in the client module, which encapsulates all HTTP operations

Fix: Enable extra task fields in Java-SDK (Netflix#3009)

* Fix: Enable extra task fields in Java-SDK

* Enables `Start Delay` field for a Task.
* Enables `Optional` field for a Task.

Add Supercharge

Fix update with large payload task result (Netflix#2982)

* fix update with large payload task result

* retryOperation method refactored

Co-authored-by: Aravindan Ramkumar <1028385+aravindanr@users.noreply.github.com>

reference community repo from readme

Merge pull request Netflix#2774 from Netflix/move_modules

empty out contribs in prep of community repo

Merge pull request Netflix#2774 from Netflix/move_modules

empty out contribs in prep of community repo

spotless format

spotless format

added dedicated methods to serialize/deserialize input/output data