feat: Implement Filesystem and MongoDB provenance writers for PackRun execution context

- Added `FilesystemPackRunProvenanceWriter` to write provenance manifests to the filesystem.
- Introduced `MongoPackRunArtifactReader` to read artifacts from MongoDB.
- Created `MongoPackRunProvenanceWriter` to store provenance manifests in MongoDB.
- Developed unit tests for filesystem and MongoDB provenance writers.
- Established `ITimelineEventStore` and `ITimelineIngestionService` interfaces for timeline event handling.
- Implemented `TimelineIngestionService` to validate and persist timeline events with hashing.
- Created PostgreSQL schema and migration scripts for timeline indexing.
- Added dependency injection support for timeline indexer services.
- Developed tests for timeline ingestion and schema validation.

bench/reachability-benchmark/cases/js/express-eval/case.yaml

@@ -0,0 +1,38 @@
+id: "js-express-eval:003"
+language: js
+project: express-eval
+version: "1.0.0"
+description: "Admin exec endpoint evaluates user code"
+entrypoints:
+  - "POST /api/admin/exec"
+sinks:
+  - id: "ExpressEval::exec"
+    path: "src/app.js::createServer"
+    kind: "process"
+    location:
+      file: src/app.js
+      line: 17
+    notes: "eval(code) on admin path"
+environment:
+  os_image: "node:20-alpine"
+  runtime:
+    node: "20.11.0"
+  source_date_epoch: 1730000000
+build:
+  command: "./build/build.sh"
+  source_date_epoch: 1730000000
+  outputs:
+    artifact_path: outputs/binary.tar.gz
+    sbom_path: outputs/sbom.cdx.json
+    coverage_path: outputs/coverage.json
+    traces_dir: outputs/traces
+test:
+  command: "./tests/run-tests.sh"
+  expected_coverage:
+    - outputs/coverage.json
+  expected_traces:
+    - outputs/traces/traces.json
+ground_truth:
+  summary: "Admin exec endpoint reachable and executes eval"
+  evidence_files:
+    - "../benchmark/truth/js-express-eval.json"