Reorganize rust crates into a flat crates directory, simplify some CI steps (#4496)

* Move all rust crates (except lib) into crates dir, w/o nesting

* Remove stale path from .gitattributes

* Rename lib.rs files for easier navigation

* Rename mod.rs file for easier navigation

* Fix emscripten-version path

* Fix fixtures dir paths

* Use the default rustfmt settings

* Don't use nightly on CI

crates/cli/src/tree_sitter_cli.rs

@@ -0,0 +1,25 @@
+#![doc = include_str!("../README.md")]
+
+pub mod fuzz;
+pub mod highlight;
+pub mod init;
+pub mod input;
+pub mod logger;
+pub mod parse;
+pub mod playground;
+pub mod query;
+pub mod query_testing;
+pub mod tags;
+pub mod test;
+pub mod test_highlight;
+pub mod test_tags;
+pub mod util;
+pub mod version;
+pub mod wasm;
+
+#[cfg(test)]
+mod tests;
+
+// To run compile fail tests
+#[cfg(doctest)]
+mod tests;