feat(extensions): add large container and date_millis extension types

extensions/date_millis.yaml

@@ -0,0 +1,9 @@
+%YAML 1.2
+---
+urn: "extension:io.substrait:date_millis"
+
+types:
+  - name: date_millis
+    description: "Date stored as milliseconds since epoch (64-bit)"
+    structure:
+      value: str

extensions/fixed_size_list.yaml

@@ -0,0 +1,14 @@
+%YAML 1.2
+---
+urn: "extension:io.substrait:fixed_size_list"
+
+types:
+  - name: fixed_size_list
+    description: List with a fixed number of elements
+    parameters:
+      - name: value_type
+        type: dataType
+      - name: dimension
+        type: integer
+        min: 0
+    structure: {}

extensions/large_containers.yaml

@@ -0,0 +1,19 @@
+%YAML 1.2
+---
+urn: "extension:io.substrait:large_containers"
+
+types:
+  - name: large_string
+    description: "String with 64-bit offsets (max ~8EB)"
+    structure:
+      value: str
+  - name: large_binary
+    description: "Binary with 64-bit offsets (max ~8EB)"
+    structure:
+      value: str
+  - name: large_list
+    description: "List with 64-bit offsets"
+    parameters:
+      - name: value_type
+        type: dataType
+    structure: {}