fix(dataEvents): widen event metadata typing beyond string

Event metadata accepts string, number, date, link, rich link, and monetary
amount values (per public docs and server-side handling), but the OpenAPI
schemas restrict it to additionalProperties.type: string, generating metadata
as Record<string, string> in the SDKs. Widen create_data_event_request.metadata
and data_event.metadata to additionalProperties: true in both the stable (2.14)
and preview overrides so generated SDKs type it as Record<string, unknown>.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: pkubicki

fern/openapi-overrides.yml

@@ -1418,8 +1418,7 @@ components:
             metadata:
               type: object
               description: Optional metadata about the event.
-              additionalProperties:
-                type: string
+              additionalProperties: true
               example:
                 invite_code: ADDAFRIEND
           required:
@@ -1451,8 +1450,7 @@ components:
             metadata:
               type: object
               description: Optional metadata about the event.
-              additionalProperties:
-                type: string
+              additionalProperties: true
               example:
                 invite_code: ADDAFRIEND
           required:
@@ -1486,8 +1484,7 @@ components:
             metadata:
               type: object
               description: Optional metadata about the event.
-              additionalProperties:
-                type: string
+              additionalProperties: true
               example:
                 invite_code: ADDAFRIEND
           required:
@@ -1886,6 +1883,9 @@ components:
             - collection
             - section
     data_event:
+      properties:
+        metadata:
+          additionalProperties: true
       required:
         - type
         - event_name

fern/preview-openapi-overrides.yml

@@ -114,6 +114,14 @@ components:
     custom_attributes:
       example:
         monthly_spend: '155.5'
+    create_data_event_request:
+      properties:
+        metadata:
+          additionalProperties: true
+    data_event:
+      properties:
+        metadata:
+          additionalProperties: true
     create_ticket_request:
       x-fern-type-name: CreateTicketRequestBody
       properties: