peepmatic: Define fuzz targets for various parts of peepmatic

fuzz/fuzz_targets/peepmatic_simple_automata.rs

@@ -0,0 +1,7 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use peepmatic_fuzzing::automata::simple_automata;
+
+fuzz_target!(|input_output_pairs: Vec<Vec<(u8, Vec<u8>)>>| {
+    simple_automata(input_output_pairs);
+});