feat(hpm): add descriptions to HPM events

[good-circle]

Carry an event description together with each HPM name and value, preserving the metadata while events pass through module boundaries. Add the small HPMDocDump utility that writes the four event sets to build/hpm.csv when elaboration requests a dump.

[Copilot]

Pull request overview

Adds first-class event metadata (name/value/description) for HPM performance events so descriptions can flow across module boundaries, and introduces a small utility to dump documented event sets to a CSV during elaboration.

Changes:

• Introduce PerfEventInfo(name, value, description) and migrate HasPerfEvents/HPM monitor code to use it.
• Add a tuple extension method (withDescription) to conveniently construct PerfEventInfo.
• Add HPMDocDump utility to emit a build/hpm.csv containing ordered event sets.

Reviewed changes

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

File	Description
src/main/scala/utility/package.scala	Adds an implicit helper to attach descriptions to (String, UInt) perf event tuples.
src/main/scala/utility/HPMDocDump.scala	New CSV dump utility for registered HPM event sets.
src/main/scala/utility/HardwarePerfMonitor.scala	Introduces PerfEventInfo and updates perf event plumbing to preserve descriptions.

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