feat(nvim): improve inlay hint startup

Rust analyzer seems to be one of the few lsp servers which needs a
small timeout for inlay hints to show up correctly. All other servers
get their inlay hints activated without delay.

modules/programs/nvim/plugins/nvim-lspconfig.lua

@@ -107,9 +107,13 @@ local on_attach_def = function(client, bufnr)
   }, { buffer = bufnr, silent = true })
 
   if client.server_capabilities.inlayHintProvider then
+    local slow_lsp_servers = {
+      "rust_analyzer",
+    }
+    local timeout = vim.tbl_contains(slow_lsp_servers, client.name, {}) and 500 or 0
     vim.defer_fn(function()
       vim.lsp.inlay_hint(bufnr, true)
-    end, 1000)
+    end, timeout)
   end
 end
 
@@ -173,6 +177,9 @@ lspconfig_setup("lua_ls", {
       format = {
         enable = false,
       },
+      hint = {
+        enable = true,
+      },
     },
   },
 })