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>

extensions/toml/Cargo.toml

@@ -13,4 +13,4 @@ path = "src/toml.rs"
 crate-type = ["cdylib"]
 
 [dependencies]
-zed_extension_api = "0.0.4"
+zed_extension_api = "0.0.5"

extensions/toml/src/toml.rs

@@ -72,6 +72,8 @@ impl TomlExtension {
             )
             .map_err(|err| format!("failed to download file: {err}"))?;
 
+            zed::make_file_executable(&binary_path)?;
+
             let entries = fs::read_dir(".")
                 .map_err(|err| format!("failed to list working directory {err}"))?;
             for entry in entries {