Move all crates to a top-level crates folder

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/buffer/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "buffer"
+version = "0.1.0"
+edition = "2018"
+
+[features]
+test-support = ["rand"]
+
+[dependencies]
+anyhow = "1.0.38"
+arrayvec = "0.7.1"
+clock = { path = "../clock" }
+gpui = { path = "../gpui" }
+lazy_static = "1.4"
+log = "0.4"
+parking_lot = "0.11.1"
+rand = { version = "0.8.3", optional = true }
+seahash = "4.1"
+serde = { version = "1", features = ["derive"] }
+similar = "1.3"
+smallvec = { version = "1.6", features = ["union"] }
+sum_tree = { path = "../sum_tree" }
+tree-sitter = "0.19.5"
+zrpc = { path = "../zrpc" }
+
+[dev-dependencies]
+rand = "0.8.3"
+tree-sitter-rust = "0.19.0"
+unindent = "0.1.7"