Add d3-format to package.json to fix cloudflare build. Will be replaced by Svelte UX format after design-token merge

Author: techniq

packages/layerchart/package.json

@@ -69,6 +69,7 @@
     "d3-array": "^3.2.4",
     "d3-delaunay": "^6.0.4",
     "d3-dsv": "^3.0.1",
+    "d3-format": "^3.1.0",
     "d3-geo": "^3.1.0",
     "d3-hierarchy": "^3.1.2",
     "d3-interpolate": "^3.0.1",