Rust: Vendor 3rdparty dependencies.

We've been observing some performance issues using crate_universe on CI.
Therefore, we're moving to vendor the auto-generated BUILD files
in our repository. This should provide a nice speed boost, while
getting rid of the complexity of the "rust cache" job we've been using
when we had a lot of git dependencies.

This PR includes a vendor script, and I'll put up a CI job internally
that runs that vendor script on Cargo.toml and Cargo.lock changes, to check
that the vendored files are in sync.

python/extractor/tsg-python/BUILD.bazel

@@ -1,5 +1,5 @@
-load("@py_deps//:defs.bzl", "aliases", "all_crate_deps")
 load("//misc/bazel:rust.bzl", "codeql_rust_binary")
+load("//misc/bazel/3rdparty/py_deps:defs.bzl", "aliases", "all_crate_deps")
 
 codeql_rust_binary(
     name = "tsg-python",
@@ -14,3 +14,8 @@ codeql_rust_binary(
         normal = True,
     ) + ["//python/extractor/tsg-python/tsp"],
 )
+
+exports_files([
+    "Cargo.toml",
+    "Cargo.lock",
+])

python/extractor/tsg-python/Cargo.toml

@@ -6,6 +6,7 @@ version = "0.1.0"
 authors = ["Taus Brock-Nannestad <tausbn@github.com>"]
 edition = "2021"
 
+# When updating these dependencies, run `misc/bazel/3rdparty/update_cargo_deps.sh`
 [dependencies]
 anyhow = "1.0"
 regex = "1"

python/extractor/tsg-python/tsp/BUILD.bazel

@@ -1,6 +1,6 @@
-load("@py_deps//:defs.bzl", "aliases", "all_crate_deps")
 load("@rules_rust//cargo:defs.bzl", "cargo_build_script")
 load("@rules_rust//rust:defs.bzl", "rust_library")
+load("//misc/bazel/3rdparty/py_deps:defs.bzl", "aliases", "all_crate_deps")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -36,3 +36,5 @@ rust_library(
         normal = True,
     ),
 )
+
+exports_files(["Cargo.toml"])

python/extractor/tsg-python/tsp/Cargo.toml

@@ -24,6 +24,7 @@ include = [
 [lib]
 path = "bindings/rust/lib.rs"
 
+## When updating these dependencies, run `misc/bazel/3rdparty/update_cargo_deps.sh`
 [dependencies]
 tree-sitter = ">= 0.20, < 0.21"