Add support for derive `Into<Target>` #2371

# to view logs

Job	Run time
miri / miri	55s
msrv / prepare	4s
test / prepare	2s
tidy / prepare	2s
test / test (stable, ubuntu-latest)	4m 33s
test / test (beta, ubuntu-latest)	4m 36s
test / test (nightly, ubuntu-latest)	49s
test / test (nightly, macos-latest)	1m 3s
test / test (nightly, windows-latest)	1m 46s
tidy / tidy	53s
tidy / clippy	31s
tidy / deny	15s
tidy / check-external-types	0s
tidy / codegen	0s
tidy / docs / docs	14s
msrv / build (ubuntu-latest)	8m 56s
msrv / build (windows-latest)	9m 9s
	33m 48s

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