Added dedicated methods to serialize/deserialize input/output data

[aravindanr]

Pull Request type

• Bugfix
• Feature
• Refactoring (no functional changes, no api changes)
• Build related changes (Please run ./gradlew generateLock saveLock to refresh dependencies)
• WHOSUSING.md
• Other (please describe):

Changes in this PR

Introduced methods for reading input and output data during the serialization process. The existing getters have logic to check to where the payload exists and return them. During serialization, the getter returns the large payload which is then persisted along with the execution data.

Issue #2899

Alternatives considered

This is a temporary patch to fix the issue introduced in 3.6.0 and 3.6.1. A more elaborate fix is to refactor all references of getInput or getOutput methods to use a new method and remove the additional logic (of checking the external storage path) from them.