Update rust-analyzer import assist config

Author: bjorn3

.vscode/settings.json

@@ -1,7 +1,9 @@
 {
     // source for rustc_* is not included in the rust-src component; disable the errors about this
     "rust-analyzer.diagnostics.disabled": ["unresolved-extern-crate", "unresolved-macro-call"],
-    "rust-analyzer.assist.importMergeBehavior": "last",
+    "rust-analyzer.assist.importGranularity": "module",
+    "rust-analyzer.assist.importEnforceGranularity": true,
+    "rust-analyzer.assist.importPrefix": "by_crate",
     "rust-analyzer.cargo.runBuildScripts": true,
     "rust-analyzer.linkedProjects": [
         "./Cargo.toml",