Implement strongly typed cast from/to JSValue #424

Job	Run time
build (windows-latest, net472, 20.x, Release)	6m 52s
build (windows-latest, net6.0, 20.x, Release)	7m 19s
build (windows-latest, net8.0, 18.x, Release)	6m 32s
build (windows-latest, net8.0, 20.x, Release)	8m 42s
build (macos-latest, net6.0, 20.x, Release)	2m 45s
build (macos-latest, net8.0, 18.x, Release)	4m 50s
build (macos-latest, net8.0, 20.x, Release)	4m 4s
build (ubuntu-latest, net6.0, 20.x, Release)	3m 32s
build (ubuntu-latest, net8.0, 18.x, Release)	5m 1s
build (ubuntu-latest, net8.0, 20.x, Release)	5m 20s
	54m 57s

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