Make `RsaKeyData::new` fallible #575

Job	Run time
test (ubuntu-latest, stable, sudo apt-get install libpcsclite-dev)	1m 48s
test (windows-latest, stable, true)	5m 42s
test (macos-latest, stable, true)	2m 28s
test (ubuntu-latest, 1.65.0, sudo apt-get install libpcsclite-dev)	3m 43s
test (windows-latest, 1.65.0, true)	5m 15s
test (macos-latest, 1.65.0, true)	3m 55s
check	1m 1s
clippy	1m 5s
rustfmt	9s
	25m 6s

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