chore: add beachball change file

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: janechu

change/@microsoft-fast-html-convert-observer-map-attribute-map.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Replace TemplateElement.options() with standalone observerMap() and attributeMap() currying functions",
+  "packageName": "@microsoft/fast-html",
+  "email": "7559015+janechu@users.noreply.github.com",
+  "dependentChangeType": "none"
+}