Add dom ES lib for Blob support

Author: kstich

smithy-typescript-codegen/src/main/resources/software/amazon/smithy/typescript/codegen/tsconfig.es.json

@@ -7,6 +7,7 @@
     "declaration": false,
     "declarationDir": null,
     "lib": [
+      "dom",
       "es5",
       "es2015.promise",
       "es2015.collection",