bug#59153: List project buffers

[Juri Linkov]

> This is a really helpful feature. A query though. Will that be another
> feature request for the users of ibuffer. May be a variable
> `project-list-buffers-function`.

Probably this could be implemented in ibuffer.el.
So when ibuffer is loaded, it could override the
keybinding 'C-x p C-b' with own function that uses
ibuffer filters with the current project buffers.