Show kernel options in a picker (#20274)

Closes #18341

* [x] Remove "Change Kernel" Doc link from REPL menu
* [x] Remove chevron
* [x] Set a higher min width
* [x] Include the language along with the kernel name

Future PRs will address

* Add support for Python envs (#18291, #16757, #15563)
* Add support for Remote kernels
* Project settings support (#16898)

Release Notes:

- Added kernel picker for repl

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>

crates/repl/src/repl.rs

@@ -1,4 +1,4 @@
-mod components;
+pub mod components;
 mod jupyter_settings;
 mod kernels;
 pub mod notebook;
@@ -26,6 +26,8 @@ use crate::repl_store::ReplStore;
 pub use crate::session::Session;
 use client::telemetry::Telemetry;
 
+pub const KERNEL_DOCS_URL: &str = "https://zed.dev/docs/repl#changing-kernels";
+
 pub fn init(fs: Arc<dyn Fs>, telemetry: Arc<Telemetry>, cx: &mut AppContext) {
     set_dispatcher(zed_dispatcher(cx));
     JupyterSettings::register(cx);