Add code splitting and create a main and a demo bundle

packages/person-select/assets/index.html

packages/person-select/karma.conf.js

packages/person-select/package.json

packages/person-select/rollup.config.js

packages/person-select/src/demo.js

packages/person-select/src/index.js

packages/person-select/src/vpu-person-select-demo.js

packages/person-select/src/vpu-person-select.js

packages/person-select/test/unit.js