Allow LauncherInterceptors to be discovered when the launcher is used as a Java module

[shartte]

Overview

Fixes #3561 by including the new LauncherInterceptor service in the module metadata for the launcher JPMS module.
Otherwise in the context of Java Modules, it cannot use ServiceLoader to look up implementations of LauncherInterceptor.

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Definition of Done

• There are no TODOs left in the code
• Method preconditions are checked and documented in the method's Javadoc
• Coding conventions (e.g. for logging) have been followed
• Change is covered by automated tests including corner cases, errors, and exception handling (NOTE: I do not think there are automated tests for JPMS Found a test that checks for the module declarations and adapted it)
• Public API has Javadoc and @API annotations
• Change is documented in the User Guide and Release Notes

[sormuras]

Good catch and fix!
Including the addition of LauncherSessionListener to the module API documentation.