Move crates under a sub folder to clean up the code

crates/benchmarks/Cargo.toml

@@ -0,0 +1,50 @@
+[package]
+name = "benchmarks"
+publish = false
+
+version.workspace = true
+authors.workspace = true
+description.workspace = true
+homepage.workspace = true
+readme.workspace = true
+edition.workspace = true
+license.workspace = true
+
+[dependencies]
+anyhow = "1.0.86"
+csv = "1.3.0"
+milli = { path = "../milli" }
+mimalloc = { version = "0.1.43", default-features = false }
+serde_json = { version = "1.0.120", features = ["preserve_order"] }
+
+[dev-dependencies]
+criterion = { version = "0.5.1", features = ["html_reports"] }
+rand = "0.8.5"
+rand_chacha = "0.3.1"
+roaring = "0.10.6"
+
+[build-dependencies]
+anyhow = "1.0.86"
+bytes = "1.6.0"
+convert_case = "0.6.0"
+flate2 = "1.0.30"
+reqwest = { version = "0.12.5", features = ["blocking", "rustls-tls"], default-features = false }
+
+[features]
+default = ["milli/all-tokenizations"]
+
+[[bench]]
+name = "search_songs"
+harness = false
+
+[[bench]]
+name = "search_wiki"
+harness = false
+
+[[bench]]
+name = "search_geo"
+harness = false
+
+[[bench]]
+name = "indexing"
+harness = false