Remove rust_object_field usage from Throwable, Class, ZipFile, InputStreamReader #675

Job	Run time
rust_ci (macos-latest, beta)	1m 38s
rust_ci (windows-latest, beta)	3m 8s
rust_ci (ubuntu-latest, stable)	1m 22s
rust_ci (macos-latest, stable)	1m 4s
rust_ci (ubuntu-latest, beta)	1m 28s
rust_ci (windows-latest, stable)	2m 42s
	11m 22s

Provide feedback