FR: add custom option to control chat inserters per root view

[qingshuizheng]

Hello @zevlg ,

This has been discussed in telega.el channel: https://t.me/emacs_telega/42785

With this snippet to get a telega-view-folders view, but with compat inserter, but the new msg keeps coming in.

(let ((telega-inserter-for-chat-button #'telega-ins--chat-compact))
  (telega-view-folders))

You mentioned that we could add custom option to control chat inserters per root view.

There's no hurry, thanks!

Zheng