chore(config): add silent_warning options (#378)

Signed-off-by: Aaron Pham <contact@aarnphm.xyz>

lua/avante/utils/init.lua

@@ -321,6 +321,10 @@ end
 ---@param msg string|string[]
 ---@param opts? LazyNotifyOpts
 function M.warn(msg, opts)
+  if require("avante.config").options.silent_warning then
+    return
+  end
+
   opts = opts or {}
   opts.level = vim.log.levels.WARN
   M.notify(msg, opts)