move the fuzz_date fuzzers

fuzz/.gitignore

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+target
+corpus
+artifacts

fuzz/Cargo.toml

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+# spell-checker:ignore libfuzzer
+
+[package]
+name = "uucore-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.uucore]
+path = "../src/uucore/"
+
+[dependencies.uu_date]
+path = "../src/uu/date/"
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_date"
+path = "fuzz_targets/fuzz_date.rs"
+test = false
+doc = false

fuzz/fuzz_targets/fuzz_date.rs

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+// 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);
+});