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/baseline.csv

@@ -1,6 +1,7 @@
 scenario,iterations,sample_count,mean_ms,p95_ms,max_ms
-node_monorepo_walk,5,4,9.4303,36.1354,45.0012
-java_demo_archive,5,1,20.6964,81.5592,101.7846
-go_buildinfo_fixture,5,2,35.0345,136.5466,170.1612
-dotnet_multirid_fixture,5,2,29.1862,106.6249,132.3018
-python_site_packages_walk,5,3,12.0024,45.0165,56.0003
+node_monorepo_walk,5,4,6.0975,21.7421,26.8537
+java_demo_archive,5,1,6.2007,23.4837,29.1143
+go_buildinfo_fixture,5,2,6.1949,22.6851,27.9196
+dotnet_multirid_fixture,5,2,11.4884,37.7460,46.4850
+python_site_packages_scan,5,3,5.6420,18.2943,22.3739
+python_pip_cache_fixture,5,1,5.8598,13.2855,15.6256