tiup cluster edit-config should give warning or error when user try to modify PD configurations

[mayjiang0203]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

Since most of the PD configuration can't be changed according to edit-config, which only supports changes by pd-ctl.
So, please return an error and provide a suggestion when the user tries to do that.

2. What did you expect to see?

3. What did you see instead?

4. What version of TiUP are you using (tiup --version)?