misc(build): use rollup to build lighthouse-core bundles

package.json

@@ -37,7 +37,7 @@
  "start": "yarn build-report --standalone && node ./lighthouse-cli/index.js",
  "jest": "node --experimental-vm-modules ./node_modules/jest/bin/jest.js",
  "test": "yarn diff:sample-json && yarn lint --quiet && yarn unit && yarn type-check",
- "test-bundle": "yarn smoke --runner bundle -j=1 --retries=2 a11y dbw",
+ "test-bundle": "yarn smoke --runner bundle -j=1 --retries=2 a11y dbw source-maps",
  "test-clients": "yarn jest \"$PWD/clients/\" && yarn jest --testMatch=\"**/clients/test/**/*-test-pptr.js\"",
  "test-viewer": "yarn unit-viewer && yarn jest --testMatch=\"**/viewer/**/*-test-pptr.js\"",
  "test-treemap": "yarn unit-treemap && yarn jest --testMatch=\"**/treemap/**/*-test-pptr.js\"",