Resolved PR comments and added more fuzz targets.

fuzz/fuzz_targets/fuzz_target_process_ctap_command.rs

@@ -0,0 +1,9 @@
+#![no_main]
+
+use fuzz_helper::process_ctap_any_type;
+use libfuzzer_sys::fuzz_target;
+
+// Generically fuzz inputs as CTAP commands.
+fuzz_target!(|data: &[u8]| {
+    process_ctap_any_type(data);
+});