feat: Add RustFS artifact object store and migration tool

- Implemented RustFsArtifactObjectStore for managing artifacts in RustFS.
- Added unit tests for RustFsArtifactObjectStore functionality.
- Created a RustFS migrator tool to transfer objects from S3 to RustFS.
- Introduced policy preview and report models for API integration.
- Added fixtures and tests for policy preview and report functionality.
- Included necessary metadata and scripts for cache_pkg package.

bench/Scanner.Analyzers/StellaOps.Bench.ScannerAnalyzers/Baseline/BaselineEntry.cs

@@ -0,0 +1,9 @@
+namespace StellaOps.Bench.ScannerAnalyzers.Baseline;
+
+internal sealed record BaselineEntry(
+    string ScenarioId,
+    int Iterations,
+    int SampleCount,
+    double MeanMs,
+    double P95Ms,
+    double MaxMs);