feat: add Get Workunit Metrics tool for performance metrics retrieval

[GordonSmith]

No description provided.

[Copilot]

Pull request overview

This PR adds a new Language Model tool for fetching detailed workunit metrics and performance information from HPCC Platform workunits.

• Introduces GetWorkunitMetricsTool to retrieve normalized performance metrics for a specific workunit by WUID
• Integrates the new tool into the ECL extension's LM tools registry
• Adds corresponding package.json contributions with proper schema and metadata

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/ecl/lm/tools/getWorkunitMetrics.ts	New tool implementation that fetches normalized workunit metrics including execution details, timing, and resource usage via the @hpcc-js/comms Workunit API
src/ecl/lm/tools.ts	Registers the new GetWorkunitMetricsTool in the extension's LM tools collection
package.json	Adds languageModelTools contribution entry for ecl-extension-getWorkunitMetrics with appropriate tags, display name, model description, and input schema

[Copilot]

Pull request overview

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.