feat: lsp tools exp

[wenytang-ms]

setup java LSP tool exp

1. All the Tool, prompt, skill are controlled by the Exp config.vscode-java-dependency.enableLspTools
2. add the chatInstructions to chat to leverage the tool when the LSP ready
3. add skills to copilot to leverage the tool when LSP ready
4. register languaemodeltool after LSP ready
5. add 6 tools. lsp_java_findSymbol, lsp_java_getCallHierarchy, lsp_java_getTypeHierarchy, lsp_java_getTypeAtPosition, lsp_java_getFileStructure, lsp_java_getFileImports

demo record

[Copilot]

Pull request overview

Adds an experimental set of Java Language Server (jdtls/LSP)-backed “language model tools” (lsp_java_*) and accompanying chat skill/instructions, gated behind a new vscode-java-dependency.enableLspTools setting, plus a new jdtls extension command to return classified imports.

Changes:

• Registers 6 Java LSP tools (document/workspace symbols, hover/type, call hierarchy, type hierarchy, and file imports) and contributes their metadata to VS Code.
• Adds a new jdtls workspace command (java.project.getFileImports) with result models to support the tools.
• Introduces an experimental setting gate and bumps the VS Code engine / typings version.

Reviewed changes

Copilot reviewed 14 out of 15 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
src/extension.ts	Switches post-jdtls-ready Copilot integration hook to register LSP tools under a setting gate.
src/copilot/tools/javaContextTools.ts	Implements the 6 lsp_java_* tools and registers them via vscode.lm.
src/commands.ts	Adds the new JAVA_PROJECT_GET_FILE_IMPORTS command constant.
resources/skills/java-lsp-tools/SKILL.md	Adds a chat “skill” describing how/when to use the tools.
resources/instruments/javaLspContext.instructions.md	Adds chat instructions intended to steer tool usage in Java workspaces.
package.json	Contributes languageModelTools, chatSkills, chatInstructions, adds the experimental config flag, and bumps VS Code engine/typings.
package.nls.json	Adds localized description text for the new config flag.
package-lock.json	Updates lockfile to reflect the VS Code typings/version bump.
jdtls.ext/.../CommandHandler.java	Wires the new java.project.getFileImports workspace command to a handler.
jdtls.ext/.../AiContextCommand.java	Implements AST-only import extraction + heuristic classification.
jdtls.ext/.../model/*.java	Adds result model classes for AI-oriented structured outputs (incl. imports).
jdtls.ext/.../plugin.xml	Registers the new java.project.getFileImports command with the plugin.

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