Improve serialization format of `EffectAsset` #569

Job	Run time
Coverage	4m 52s
Check format	1m 14s
build (2d, stable, windows-latest)	8m 38s
run-examples	13m 45s
build (2d, stable, ubuntu-latest)	13m 16s
build (2d, stable, macos-latest)	3m 25s
build (3d, stable, windows-latest)	8m 16s
build (3d, stable, ubuntu-latest)	12m 49s
build (3d, stable, macos-latest)	7m 25s
build (all, stable, windows-latest)	8m 32s
build (all, stable, ubuntu-latest)	8m 24s
build (all, stable, macos-latest)	6m 31s
	1h 37m 7s

Provide feedback