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Add implementation of `FormData` builtin #465

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Run time

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Job	Run time
Test (release, ubuntu-latest)	5m 41s
Web Platform Tests (release)	6m 53s
Test (weval, ubuntu-latest)	4m 24s
Web Platform Tests (debug)	7m 19s
Web Platform Tests (weval)	4m 41s
	28m 58s