Implement quickfix / location list

[sschuldenzucker]

I'm coming from neovim/nvchad and one workflow I often use is:

• Trigger global (directory) search and search for something and press C-q to copy the list of matching locations to the vim's quickfix list
• Alternatively, perform a search in an external tool like ripgrep and load the results into the quickfix list via :cfile
• Step through the quickfix list one-by-one and review/fix things.

AFAIU helix doesn't have anything like a quickfix list and I feel it's a real omission because:

• The quickfix list is stateful: it provides a stable and visible place of all locations I want to look at, and it remembers the location in the list where I am right now.
• It doesn't seem to have any good counterpart in helix right now: I don't see any other helix features that could help me realize the above workflow.

IMHO it's not necessary to implement a quickfix- and location list, like vim. A single one should be enough. As a first step, implementing something like :cfile would also be enough IMHO.

[sschuldenzucker]

Related: #5902

[pascalkuthe]

Yeah duplicate of #5902

The only thing I see us implementing is multi buffers (like #4381 but with better UI)