[Feature Request] eglot--progress-reporters support?

[Icy-Thought]

Is your feature request related to a problem? Please describe.
I recently noticed the lack of support for eglot--progress-reporters and thought I should create an issue for it. The reason for this request is to allow the user to tell when to expect completions to work when typing the major-mode buffer. And in my case, this is very helpful when working with rust related code projects.

Describe the solution you'd like
Support the the progress report that Eglot supplies Emacs's default mode-line with.

Describe alternatives you've considered
I have considered switching to the Emacs built-in mode-line, but found it tedious to setup.

Additional context
What the progress report looks like outside of doom-modeline: