Added generic MPN barcode scanning (#13266)

* Added generic MPN barcode scanning

- Provides generic lookup against MPN
- Runs with lower priority (fallback only)
- Barcode plugins are now ordered by decreasing priority

* Apply suggestion from @matmair

* Bump internal priority

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Co-authored-by: Matthias Mair <code@mjmair.com>

docs/mkdocs.yml

@@ -255,6 +255,7 @@ nav:
         - LCSC Barcode Plugin: plugins/builtin/barcode_lcsc.md
         - Mouser Barcode Plugin: plugins/builtin/barcode_mouser.md
         - TME Barcode Plugin: plugins/builtin/barcode_tme.md
+        - Manufacturer Barcode Plugin: plugins/builtin/barcode_manufacturer.md
       - Event Plugins:
         - Auto Create Builds: plugins/builtin/auto_create_builds.md
         - Auto Issue: plugins/builtin/auto_issue.md