This PR updates the PHP extension to use `intelephense` from the PATH,
if it exists.
Tested using the following Nix shell:
```sh
NIXPKGS_ALLOW_UNFREE=1 nix-shell -p php nodePackages_latest.intelephense
```
Resolves#11994.
Release Notes:
- N/A
This PR extends the PHP extension with
[Phpactor](https://github.com/phpactor/phpactor) support.
Phpactor seems to provide a better feature set out-of-the-box for free,
so it has been made the default PHP language server.
Thank you to @xtrasmal for informing us of Phpactor's existence!
Release Notes:
- N/A
This PR extracts PHP support into an extension and removes the built-in
PHP support from Zed.
There's a small workaround necessary in order for us to provide the
`language_ids` on the `LspAdapter` that are needed for the language
server to run properly. Eventually we'll want to build this into the
extension API, but for now we're just hard-coding it on the host side.
Release Notes:
- Removed built-in support for PHP, in favor of making it available as
an extension. The PHP extension will be suggested for download when you
open a `.php` file.
