chore(dev): Add es5 aliases for build:dist commands in browser (#3600)

Every other package besides browser uses build:es5 for hopefully self-explanatory purposes. 
The browser package uses build:dist to do the same thing. This adds build:es5 as an alias for 
build:dist, so the commands are standardized across packages and so that they can be run 
as a group in lerna or run when looping through packages manually.

Author: lobsterkatie

packages/browser/package.json

@@ -60,6 +60,8 @@
     "build:bundle:watch": "rollup --config --watch",
     "build:dist": "tsc -p tsconfig.build.json",
     "build:dist:watch": "tsc -p tsconfig.build.json -w --preserveWatchOutput",
+    "build:es5": "run-s build:dist",
+    "build:es5:watch": "run-s build:dist:watch",
     "build:esm": "tsc -p tsconfig.esm.json",
     "build:esm:watch": "tsc -p tsconfig.esm.json -w --preserveWatchOutput",
     "build:watch": "run-p build:dist:watch build:esm:watch build:bundle:watch",