move the benchmarks to another crate so we can download the datasets automatically without adding overhead to the build of milli

benchmarks/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "benchmarks"
+version = "0.1.0"
+edition = "2018"
+publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+milli = { path = "../milli" }
+
+[dev-dependencies]
+heed = "*" # we want to use the version milli uses
+criterion = "0.3.4"
+
+[build-dependencies]
+anyhow = "1.0"
+bytes = "1.0"
+flate2 = "1.0.20"
+convert_case = "0.4"
+reqwest = { version = "0.11.3", features = ["blocking", "rustls-tls"], default-features = false }
+
+[[bench]]
+name = "songs"
+harness = false
+
+[[bench]]
+name = "wiki"
+harness = false