0.6.2 Experimental data client API for a browser, Puppeteer and Playwright

• [EXPERIMENTAL] Added new entry points (exports):
  • react-render-tracker/data-client – data client API to interact with React Render Tracker
  • react-render-tracker/headless-browser-client – an adapter for headless browser frameworks which is applied to a page object to get the data client API in the context of the page
• Added warning when non-development version of React is used instead of trying to inspect it and crash
• Bumped rempl to 1.0.0-alpha.20