Add App Inventory module for parsing-coverage analysis

scripts/alternate_artifacts/README.md

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+# Alternate artifacts
+
+Artifacts in this folder are **not** part of a normal iLEAPP run. They are
+developer/tooling oriented modules that are only loaded when the CLI is given
+this folder explicitly:
+
+```
+python3 ileapp.py -t zip -i <extraction.zip> -o <output> \
+    --custom_artifacts_path scripts/alternate_artifacts
+```
+
+The GUI and default CLI runs never load them, so regular users are unaffected.
+
+## Modules
+
+- **appInventory.py** — writes three tables into the LAVA SQLite output
+  (`_lava_artifacts.db`) for parsing-coverage analysis (used by batch-leapp to
+  determine which installed apps are not parsed by the tooling):
+  - `extractioninfo`: extraction/device/run identifiers
+  - `installedappinventory`: one row per app container (bundle ID, path, UUID)
+  - `appfileinventory`: every file in the extraction mapped to its app
+    container (lava_only; can be hundreds of thousands of rows)