build: Use rust-project.json (#10)

Now that https://github.com/bazelbuild/rules_rust/pull/2450 is fixed, we
can use a `rust-project.json` instead of `Cargo.toml` for IDE features.

.gitignore

@@ -1,3 +1,4 @@
 /target
 /bazel-*
-/MODULE.bazel.lock
+/MODULE.bazel.lock
+/rust-project.json

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "rust-analyzer.linkedProjects": [
+        "rust-project.json"
+    ]
+}

.vscode/tasks.json

@@ -0,0 +1,22 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Generate rust-project.json",
+            "command": "bazel",
+            "args": ["run", "@rules_rust//tools/rust_analyzer:gen_rust_project"],
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": "build",
+            "problemMatcher": [],
+            "presentation": {
+                "reveal": "never",
+                "panel": "dedicated",
+            },
+            "runOptions": {
+                "runOn": "folderOpen"
+            }
+        },
+    ]
+}

MODULE.bazel

@@ -1,5 +1,7 @@
 bazel_dep(name = "rules_rust", version = "0.38.0")
 
+git_override(module_name = "rules_rust", remote = "https://github.com/bazelbuild/rules_rust.git", commit = "547f6a0666024c4b14b794598ecac3ce56a5e950")
+
 rust = use_extension("@rules_rust//rust:extensions.bzl", "rust")
 rust.toolchain(
     edition = "2021",