move the fuzz_date fuzzers

fuzz/Cargo.toml

@@ -0,0 +1,29 @@
+# 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