Add a simple fuzz-testing harness for the sql parser (#1864)

lib/fuzz/.gitignore

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+target
+corpus
+artifacts
+coverage

lib/fuzz/Cargo.toml

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+[package]
+name = "surrealdb-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = { version= "0.4", features = ["arbitrary-derive"] }
+arbitrary = { version = "1", features = ["derive"] }
+
+[dependencies.surrealdb]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[profile.release]
+debug = 1
+
+[[bin]]
+name = "fuzz_sql_parser"
+path = "fuzz_targets/fuzz_sql_parser.rs"
+test = false
+doc = false

lib/fuzz/fuzz_targets/fuzz_sql_parser.rs

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+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &str| {
+	// Don't crash.
+	_ = surrealdb::sql::parse(data);
+});