Introduce extension-cli binary, for packaging extensions in CI (#9523)

This will be used in the
[extensions](https://github.com/zed-industries/extensions) repository
for packaging the extensions that users submit.

Release Notes:

- N/A

---------

Co-authored-by: Marshall Bowers <elliott.codes@gmail.com>

Cargo.lock

@@ -3514,6 +3514,24 @@ dependencies = [
  "wit-component 0.20.3",
 ]
 
+[[package]]
+name = "extension_cli"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "clap 4.4.4",
+ "env_logger",
+ "extension",
+ "fs",
+ "language",
+ "log",
+ "theme",
+ "tokio",
+ "toml 0.8.10",
+ "tree-sitter",
+ "wasmtime",
+]
+
 [[package]]
 name = "extensions_ui"
 version = "0.1.0"