feat: add CreatedDateUtc and AssociationDateUtc to Association schema

Add CreatedDateUtc and AssociationDateUtc properties to the Association schema,
add missing Size and new AssociationDateUtc to the sort enum, and add default
sort by CreatedDateUtc for associations.

Author: Will Molloy

xero_files.yaml

@@ -415,7 +415,10 @@ paths:
             type: string
             enum:
               - Name
-              - CreatedDateUTC
+              - Size
+              - CreatedDateUtc
+              - AssociationDateUtc
+            default: CreatedDateUtc
             example: Associations/{ObjectId}?sort=CreatedDateUtc
         - in: query
           name: direction
@@ -435,7 +438,7 @@ paths:
                 type: array
                 items:
                   $ref: "#/components/schemas/Association"
-              example: '[ { "SendWithObject":false, "Name":"testfile.pdf", "Size":12357, "FileId":"6beccb4a-0d7d-4518-93f3-e0cd1dccb254", "ObjectId":"1270bf7c-5d18-473a-9231-1e36c4bd33ed", "ObjectType":"Business", "ObjectGroup":"Contact" } ]'
+              example: '[ { "SendWithObject":false, "Name":"testfile.pdf", "Size":12357, "CreatedDateUtc":"2020-12-10T01:22:00.0000000", "AssociationDateUtc":"2020-12-10T01:22:00.0000000", "FileId":"6beccb4a-0d7d-4518-93f3-e0cd1dccb254", "ObjectId":"1270bf7c-5d18-473a-9231-1e36c4bd33ed", "ObjectType":"Business", "ObjectGroup":"Contact" } ]'
   /Associations/Count:
     parameters:
       - $ref: "#/components/parameters/requiredHeader"
@@ -828,6 +831,16 @@ components:
           description: The size of the associated file in bytes. Note- The Size element is only returned when using /Associations/{ObjectId} endpoint.
           type: integer
           example: 12357
+        CreatedDateUtc:
+          description: The date the file was created (UTC). Note- The CreatedDateUtc element is only returned when using /Associations/{ObjectId} endpoint.
+          type: string
+          format: date-time
+          example: "2020-12-10T01:22:00.0000000"
+        AssociationDateUtc:
+          description: The date the file was associated with the object (UTC). Note- The AssociationDateUtc element is only returned when using /Associations/{ObjectId} endpoint.
+          type: string
+          format: date-time
+          example: "2020-12-10T01:22:00.0000000"
         FileId:
           description: The unique identifier of the file
           type: string