Add option to reveal selected path in VS Code Explorer

[Prathamesh4038]

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Added a new context menu option "Reveal in VS Code Explorer" in Java Project view.
Changes:
Introduced new command java.view.package.revealFileInVSCode
Opens selected path directly in VS Code Explorer

Benefit
Improves developer workflow by avoiding switching to external file manager.

Related Issue
Addresses the request to add an option for revealing the selected path in VS Code Explorer.

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[wenytang-ms]

Hi @Prathamesh4038, thanks for the contribution! The idea of "Reveal in VS Code Explorer" is a useful feature. However, there are several issues that need to be addressed before this PR can be considered for merging:

1. Breaking change — existing command removed: You deleted the VIEW_PACKAGE_REVEAL_FILE_OS constant, which will break the existing "Reveal in OS" functionality. This should be kept.

2. Incorrect command registration: The command is registered at the module top level in commands.ts. In VS Code extensions, commands must be registered inside the activate() function and added to context.subscriptions for proper lifecycle management.

3. Missing package.json contributions: The new command is not declared in contributes.commands or contributes.menus in package.json, so it won't appear in any context menu.

4. Unrelated dependency added: @playwright/test was added to devDependencies — this is unrelated to the feature and should not be included.

5. Accidental git submodule: A vscode-java-dependency submodule pointing to this repo itself was added. This appears to be a mistake and must be removed.

6. Redundant imports: Both import { commands } from "vscode" and import * as vscode from 'vscode' exist — one is sufficient.

7. Missing localization: New user-facing strings should be added to package.nls.json (and related locale files).

Please address these issues and consider re-submitting. Feel free to look at how existing commands (e.g., revealFileInOS) are registered for reference. Thanks!