initial microbenchmarks with cargo bench

benchmarks/micro/.gitignore

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+target/

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benchmarks/micro/Cargo.toml

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+[package]
+name = "micro"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rusqlite = {version="0.31.0", features=["bundled"]}

benchmarks/micro/src/lib.rs

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+#![feature(test)]
+
+extern crate test;
+
+pub fn add_two(a: i32) -> i32 {
+    a + 2
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rusqlite::Connection;
+    use test::Bencher;
+
+    #[test]
+    fn it_works() {
+        assert_eq!(4, add_two(2));
+    }
+
+    #[bench]
+    fn bench_add_two(b: &mut Bencher) {
+        let db = Connection::open_in_memory().unwrap();
+        let v: Vec<f32> = vec![0.1, 0.2, 0.3];
+
+        b.iter(|| {
+            let sqlite_version: String = db
+                .query_row("select sqlite_version()", [], |x| x.get(0))
+                .unwrap();
+        });
+    }
+}