Dart: Faster Editor and more

The latest beta release of the Dart SDK and Editor introduces significant performance and productivity enhancements for Dart developers, focusing on automating code evolution, reducing JavaScript code size, and simplifying Dart web app deployment. Key improvements include a completely rewritten analysis engine that is 20% faster at parsing and analyzing code, eliminating the need for extensive unit testing to catch simple errors. New features such as "Rename Library" and "Convert Method to Getter" refactorings, along with improved code completion, enhance the developer experience. Additionally, Dart to JavaScript compilation now produces significantly smaller code, while Dart VM performance sees notable boosts, with full SIMD acceleration included. The release also simplifies web app deployment through the new beta pub deploy command, streamlining preparation for hosting on web servers, and all these updates are available for download from dartlang.org.