open picker (#14524)

Release Notes:

- linux: Added a fallback Open picker for when XDG is not working
- Added a new setting `use_system_path_prompts` (default true) that can
be disabled to use Zed's builtin keyboard-driven prompts.

---------

Co-authored-by: Max <max@zed.dev>

crates/file_finder/src/file_finder.rs

@@ -2,6 +2,7 @@
 mod file_finder_tests;
 
 mod new_path_prompt;
+mod open_path_prompt;
 
 use collections::{BTreeSet, HashMap};
 use editor::{scroll::Autoscroll, Bias, Editor};
@@ -13,6 +14,7 @@ use gpui::{
 };
 use itertools::Itertools;
 use new_path_prompt::NewPathPrompt;
+use open_path_prompt::OpenPathPrompt;
 use picker::{Picker, PickerDelegate};
 use project::{PathMatchCandidateSet, Project, ProjectPath, WorktreeId};
 use settings::Settings;
@@ -41,6 +43,7 @@ pub struct FileFinder {
 pub fn init(cx: &mut AppContext) {
     cx.observe_new_views(FileFinder::register).detach();
     cx.observe_new_views(NewPathPrompt::register).detach();
+    cx.observe_new_views(OpenPathPrompt::register).detach();
 }
 
 impl FileFinder {