feat: basic test runner support for rust plugin. #2228

Job	Run time
build_bridge	7m 30s
setup	12s
bridge_unit_test	9m 46s
webf_unit_test	1m 0s
multiple_page_test	2m 16s
preload_page_test	3m 19s
memory_leak_test	3m 7s
integration_test (BOM)	1m 19s
prerendering_page_test	2m 20s
integration_test (CSSOM)	1m 9s
integration_test (Storage)	1m 12s
integration_test (DOM)	2m 23s
integration_test (BoxModelAndSizing)	3m 16s
integration_test (BackgroundsAndBordersAndOverflow)	2m 32s
integration_test (FlexBoxLayoutAndPositionedLayout)	6m 14s
integration_test (FontsAndImages)	1m 52s
integration_test (TextAndColorAndFilterEffect)	1m 35s
integration_test (Transforms)	1m 17s
integration_test (Transitions)	2m 3s
integration_test (Animations)	1m 48s
integration_test (ValuesAndUnitAndVaraiables)	1m 26s
integration_test (Selectors)	1m 14s
integration_test (SVG)	1m 46s
integration_test (Rust)	1m 30s
	1h 2m 6s

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