Auto merge of #17523 - wada314:master, r=Veykril

Add an option to use "::" for the external crate prefix.

Fixes #11823 .
Hi I'm very new to rust-analyzer and not sure how the review process are. Can somebody take a look at this PR? thanks!

editors/code/package.json

@@ -1734,6 +1734,16 @@
                     }
                 }
             },
+            {
+                "title": "imports",
+                "properties": {
+                    "rust-analyzer.imports.prefixExternPrelude": {
+                        "markdownDescription": "Whether to prefix external (including std, core) crate imports with `::`. e.g. \"use ::std::io::Read;\".",
+                        "default": false,
+                        "type": "boolean"
+                    }
+                }
+            },
             {
                 "title": "inlayHints",
                 "properties": {