Add copilot crate

Refactor HTTP and github release downloading into util
Lazily download / upgrade the copilot LSP from Zed

Co-authored-by: Max <max@zed.dev>
Co-Authored-By: Antonio <antonio@zed.dev>

crates/util/src/fs.rs

@@ -0,0 +1,28 @@
+use std::path::Path;
+
+use smol::{fs, stream::StreamExt};
+
+use crate::ResultExt;
+
+// Removes all files and directories matching the given predicate
+pub async fn remove_matching<F>(dir: &Path, predicate: F)
+where
+    F: Fn(&Path) -> bool,
+{
+    if let Some(mut entries) = fs::read_dir(dir).await.log_err() {
+        while let Some(entry) = entries.next().await {
+            if let Some(entry) = entry.log_err() {
+                let entry_path = entry.path();
+                if predicate(entry_path.as_path()) {
+                    if let Ok(metadata) = fs::metadata(&entry_path).await {
+                        if metadata.is_file() {
+                            fs::remove_file(&entry_path).await.log_err();
+                        } else {
+                            fs::remove_dir_all(&entry_path).await.log_err();
+                        }
+                    }
+                }
+            }
+        }
+    }
+}