move the fuzz_date fuzzers

fuzz/fuzz_targets/fuzz_date.rs

@@ -0,0 +1,16 @@
+// spell-checker:ignore libfuzzer
+
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use std::ffi::OsString;
+use uu_date::uumain;
+
+fuzz_target!(|data: &[u8]| {
+    let delim: u8 = 0; // Null byte
+    let args = data
+        .split(|b| *b == delim)
+        .filter_map(|e| std::str::from_utf8(e).ok())
+        .map(|e| OsString::from(e));
+    uumain(args);
+});