[PATCH] Add eglot-alternatives for PHP

[USAMI Kenta]

Hi all,

This patch adds two alternate servers that take precedence over 
php-language-server registered in eglot-server-programs.

php-language-server has been abandoned since 2018 and is obsolete.
https://github.com/felixfbecker/php-language-server

Phpactor is a free software language server implementation for PHP.
https://github.com/phpactor/phpactor

Intelephense is a proprietary one, but many PHP programmers already use it.
https://intelephense.com/

This patch is same as https://github.com/joaotavora/eglot/pull/1105
I have assigned the copyright to FSF.

Best regards,

1105.patch
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