feat: Add support for scanning GGUF models from OCI registries (#4335)

---------
Signed-off-by: Christopher Phillips <32073428+spiffcs@users.noreply.github.com>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>

schema/json/schema-latest.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://json-schema.org/draft/2020-12/schema",
-  "$id": "anchore.io/schema/syft/json/16.1.2/document",
+  "$id": "anchore.io/schema/syft/json/16.1.3/document",
   "$ref": "#/$defs/Document",
   "$defs": {
     "AlpmDbEntry": {
@@ -1478,6 +1478,13 @@
         "metadataHash": {
           "type": "string",
           "description": "MetadataKeyValuesHash is a xx64 hash of all key-value pairs from the GGUF header metadata.\nThis hash is computed over the complete header metadata (including the fields extracted\ninto typed fields above) and provides a stable identifier for the model configuration\nacross different file locations or remotes. It allows matching identical models even\nwhen stored in different repositories or with different filenames."
+        },
+        "parts": {
+          "items": {
+            "$ref": "#/$defs/GgufFileHeader"
+          },
+          "type": "array",
+          "description": "Parts contains headers from additional GGUF files that were merged\ninto this package during post-processing (e.g., from OCI layers without model names)."
         }
       },
       "type": "object",