feat(rust): exclude bad directories from rust-analyzer (#5021)

## Description

rust-analyzer is unfortunately not smart enough to use a folder's
.gitignore (or similar) when looking for rust files to analyze, meaning
that when it finds a large enough folder (e.g: .git, .direnv) it
completely dies going through it searching for rust files.

This commit adds a filter of common folders that are big enough to
potentially choke rust-analyzer. The list could be amended in the
future.

## Checklist

- [X] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/extras/lang/rust.lua

@@ -92,6 +92,19 @@ return {
                 ["async-recursion"] = { "async_recursion" },
               },
             },
+            files = {
+              excludeDirs = {
+                ".direnv",
+                ".git",
+                ".github",
+                ".gitlab",
+                "bin",
+                "node_modules",
+                "target",
+                "venv",
+                ".venv",
+              },
+            },
           },
         },
       },