Add new make-file-executable API for extensions (#10047)

This PR adds a new function, `make-file-executable`, to the Zed
extension API that can be used to mark a given file as executable
(typically the language server binary).

This is available in v0.0.5 of the `zed_extension_api` crate.

We also reworked how we represent the various WIT versions on disk to
make it a bit clearer what the version number entails.

Release Notes:

- N/A

---------

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

crates/extension/src/extension_lsp_adapter.rs

@@ -57,8 +57,13 @@ impl LspAdapter for ExtensionLspAdapter {
                 .host
                 .path_from_extension(&self.extension.manifest.id, command.command.as_ref());
 
-            // TODO: Eventually we'll want to expose an extension API for doing this, but for
-            // now we just manually set the file permissions for extensions that we know need it.
+            // TODO: This should now be done via the `zed::make_file_executable` function in
+            // Zed extension API, but we're leaving these existing usages in place temporarily
+            // to avoid any compatibility issues between Zed and the extension versions.
+            //
+            // We can remove once the following extension versions no longer see any use:
+            // - toml@0.0.2
+            // - zig@0.0.1
             if ["toml", "zig"].contains(&self.extension.manifest.id.as_ref()) {
                 #[cfg(not(windows))]
                 {