Add a provider web component plus demo

packages/provider/LICENSE

packages/provider/README.md

packages/provider/assets/favicon.ico

packages/provider/assets/index.html.ejs

packages/provider/i18next-scanner.config.js

packages/provider/karma.conf.js

packages/provider/package.json

packages/provider/rollup.config.js

packages/provider/src/dbp-provider-demo.js

packages/provider/src/dbp-provider.js

packages/provider/src/demo.js

packages/provider/src/i18n.js

packages/provider/src/i18n/de/translation.json

packages/provider/src/i18n/en/translation.json

packages/provider/src/index.js

packages/provider/src/provider.js