Add `embark-consult-export-xref-grep'.

[amosbird]

Since #560 has been merged, we can also export xref items into a grep buffer.

[Kaspazza]

@oantolin Will this make consult-xref to be able to be exported to wgrep? Because I'm missing that feature a lot

[minad]

@Kaspazza I believe so. I haven't tested the feature though. Did you try it, if it works for your use case?

[Kaspazza]

@minad I've just tried it, and it doesn't work from find file search (SPC-SPC in doom emacs)
with message "embark category project-file doesn't support writable export"

I'm using doom emacs
GNU Emacs 28.2 (build 2, aarch64-apple-darwin23.4.0, NS appkit-2487.50 Version 14.4 (Build 23E214)) of 2024-03-22

I've set embark to this commit:
(package! embark
:pin "86fc40909ba9506676a28d35879f8c091018ac42"
:recipe (:host github :repo "amosbird/embark"))

And made sure to bump the package and run doom sync -u and reload.

BTW if someone is looking to make it work, an option is to do embark-export first (C-c C-;) and then export to writable buffer (C-c C-e) <- this makes it work