add rust-analyzer lsp configuration to use clippy

lua/plugins/lsp.lua

@@ -75,6 +75,19 @@ end
         filetypes = {"python"},
     })
 
+    lspconfig["rust_analyzer"].setup({
+        capabilities = capabilities,
+        filetypes = {"rust"},
+        settings = {
+            ['rust-analyzer'] = {
+                checkOnSave = true,
+                check = {
+                    command = "clippy",
+                },
+            },
+        },
+    })
+
 -- luasnip setup
 local luasnip = require 'luasnip'