Setup web platform test harness - #1328
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work in progress. This is a test harness that extracts and runs ~24,000 CSS tests from web-platform-tests. It tests CSS parsing, printing, minification and lowering. The browser mode also takes the output and inserts it into the original WPT test and runs it in a browser to verify that behavior did not change from the original test. Right now it only tests property parsing, but will eventually be expanded to selectors and other rules. The purpose is to find edge cases and missing features.
Note: the harness is entirely generated by AI and I have not yet verified its output. Lots more to be done here.