[CCV-214] Render IAM DA text assets in the attachments panel

* Adding "HTML" as a valid attachment type

Author: ikerr

labelbox/schema/asset_attachment.py

@@ -8,7 +8,7 @@ class AssetAttachment(DbObject):
     """ Asset attachment provides extra context about an asset while labeling.
 
     Attributes:
-        attachment_type (str): IMAGE, VIDEO, TEXT, or IMAGE_OVERLAY
+        attachment_type (str): IMAGE, VIDEO, TEXT, IMAGE_OVERLAY, or HTML
         attachment_value (str): URL to an external file or a string of text
     """
 
@@ -17,6 +17,7 @@ class AttachmentType(Enum):
         IMAGE = "IMAGE"
         TEXT = "TEXT"
         IMAGE_OVERLAY = "IMAGE_OVERLAY"
+        HTML = "HTML"
 
     for topic in AttachmentType:
         vars()[topic.name] = topic.value