feat(rust): add hints and navic for rustaceanvim

lua/config/plugins/rustaceanvim.lua

@@ -1,18 +1,37 @@
 local navic = require("nvim-navic")
 
 vim.g.rustaceanvim = {
+  tools = {
+    autoSetHints = true,
+    inlay_hints = {
+      show_parameter_hints = true,
+      parameter_hints_prefix = "in: ",       -- "<- "
+      other_hints_prefix = "out: "           -- "=> "
+    }
+  },
   server = {
     on_attach = function(client, bufnr)
       navic.attach(client, bufnr)      
     end,
-    filetypes = {"rust"},
     settings = {
-      -- rust-analyzer language server configuration
       ['rust-analyzer'] = {
-        cargo = {
-          allFeatures = true,
-        },
-      },
+        assist = {
+          importEnforceGranularity = true,
+          importPrefix = "create"
         },
+        cargo = { allFeatures = true },
+        checkOnSave = {
+          -- default: `cargo check`
+          command = "clippy",
+          allFeatures = true
         },
+        inlayHints = {
+          lifetimeElisionHints = {
+            enable = true,
+            useParameterNames = true
+          }
+        }
+      }
+    }
+  }
 }