Allow extensions to provide data for language_ids (#10053)

This PR makes it so extensions can provide values for the `language_ids`
method on the `LspAdapter` trait.

These are provided as data in the `language_servers` section of the
`extension.toml`, like so:

```toml
[language_servers.intelephense]
name = "Intelephense"
language = "PHP"
language_ids = { PHP = "php"}
```

Release Notes:

- N/A

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

extensions/php/extension.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/zed-industries/zed"
 [language_servers.intelephense]
 name = "Intelephense"
 language = "PHP"
+language_ids = { PHP = "php"}
 
 [grammars.php]
 repository = "https://github.com/tree-sitter/tree-sitter-php"