Add listener dispose handlers

[masesdevelopers]

Description

Introduce support for listener dispose handlers and disable the ReturnData setter. Added a LISTENER_DISPOSE_HANDLER placeholder and LISTENER_DISPOSE_HANDLER_FORMAT to Templates, updated SingleListenerMethod.template to emit the dispose placeholder, and updated InternalMethods to inject the dispose handler only for non-void return types. Also append a call to the dispose callback after func listener execution. Disabled the ReturnData setter in JNetEventResult because the JVM raises an exception when setting it.

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.