Implement headlamp-tns-csi-plugin

Full plugin implementation with 6 pages, K8s resource filtering,
Prometheus metrics parsing, kbench benchmark runner, and 67 unit tests.

## Pages
- Overview: driver health, storage summary, protocol distribution chart, non-Bound PVC alerts
- Storage Classes: tns-csi SC table with slide-in detail panel + protocol notes
- Volumes: PV table with full CSI attribute detail panel
- Snapshots: VolumeSnapshot CRDs with graceful degradation if not installed
- Metrics: Prometheus text format parser + WebSocket/Volume/CSI operation cards
- Benchmark: kbench Job+PVC lifecycle, FIO log parser, past benchmarks list

## API modules
- k8s.ts: typed resource shapes, filtering helpers, formatting utilities
- metrics.ts: Prometheus text format parser, tns-csi metric extraction
- kbench.ts: Job/PVC manifests, lifecycle management, FIO summary parser
- TnsCsiDataContext.tsx: shared React context with memoized filtered resources

## Quality
- TypeScript strict mode, zero any, discriminated union for benchmark state
- 67 tests passing (vitest + @testing-library/react)
- registerDetailsViewSection injects TNS-CSI details on PVC pages
- Graceful degradation for missing CSIDriver and VolumeSnapshot CRDs

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "extends": "@kinvolk/headlamp-plugin/config/plugins-tsconfig.json",
+  "compilerOptions": {
+    "types": ["vite/client", "vite-plugin-svgr/client", "vitest/globals", "@testing-library/jest-dom"]
+  },
+  "include": ["src"]
+}