vim: Add 'gf' command, make files cmd-clickable (#16534)

Release Notes:

- vim: Added `gf` command to open files under the cursor.
- Filenames can now be `cmd`/`ctrl`-clicked, which opens them.

TODOs:

- [x] `main_test.go` <-- works
- [x] `./my-pkg/my_pkg.go` <-- works
- [x] `../go.mod` <-- works
- [x] `my-pkg/my_pkg.go` <-- works
- [x] `my-pkg/subpkg/subpkg_test.go` <-- works
- [x] `file\ with\ space\ in\ it.txt` <-- works
- [x] `"file\ with\ space\ in\ it.txt"` <-- works
- [x] `"main_test.go"` <-- works
- [x] `/Users/thorstenball/.vimrc` <-- works, but only locally
- [x] `~/.vimrc` <--works, but only locally
- [x] Get it working over collab
- [x] Get hover links working

Demo:



https://github.com/user-attachments/assets/26af7f3b-c392-4aaf-849a-95d6c3b00067

Collab demo:




https://github.com/user-attachments/assets/272598bd-0e82-4556-8f9c-ba53d3a95682

crates/language/src/buffer.rs

@@ -383,7 +383,7 @@ pub trait File: Send + Sync {
 
 /// The file associated with a buffer, in the case where the file is on the local disk.
 pub trait LocalFile: File {
-    /// Returns the absolute path of this file.
+    /// Returns the absolute path of this file
     fn abs_path(&self, cx: &AppContext) -> PathBuf;
 
     /// Loads the file's contents from disk.