add script to run Rust Analyzer using Bazel's build products

Considerably speeds up initial load, but have not done much testing
yet.

.gitignore

@@ -5,3 +5,4 @@ anki.prof
 target
 user.bazelrc
 .dmypy.json
+rust-project.json

BUILD.bazel

@@ -1,4 +1,5 @@
 load("@bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_tar")
+load("@rules_rust//rust:defs.bzl", "rust_analyzer")
 
 config_setting(
     name = "release",
@@ -39,5 +40,10 @@ pkg_tar(
     tags = ["manual"],
 )
 
+rust_analyzer(
+    name = "rust_analyzer",
+    targets = ["//rslib:anki"],
+)
+
 # for version info
 exports_files(["defs.bzl"])

late_deps.bzl

@@ -1,6 +1,8 @@
 """Repo setup that can't happen until after defs.bzl:setup_deps() is run."""
 
 load("@py_deps//:requirements.bzl", "pip_install")
+load("@rules_rust//tools/rust_analyzer/raze:crates.bzl", "rules_rust_tools_rust_analyzer_fetch_remote_crates")
 
 def setup_late_deps():
     pip_install()
+    rules_rust_tools_rust_analyzer_fetch_remote_crates()

scripts/vscode-rust

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -e
+
+bazel run @rules_rust//tools/rust_analyzer:gen_rust_project
+code .
+