Che 7 plugin: PHP Debugger

[tsmaeder]

Build and test a Che 7 plugin based on https://marketplace.visualstudio.com/items?itemName=felixfbecker.php-debug

As always, this involves testing the extension inside Theia and filing any issues found and then finding or creating an appropriate image to run the sidecar and creating the plugin metadata for the plugin repo.

[vrubezhny]

It is possible to install (and I believe to launch) the felixfbecker.php-debug extension in theia together with bmewburn.vscode-intelephense-client extension (requires the PR eclipse-theia/theia#4772 to be applied).
The extension requires php, php-devel and php-pecl-xdebug to be installed on the system and have php to be configured to use Xdebug Zend extension in php.ini:

; Use Zend extension with Xdebug:
zend_extension="xdebug.so"

[XDebug]
xdebug.remote_enable = 1
xdebug.remote_autostart = 1

However I currently I can't run a test php script in debuger as it complains on not recognized debug type php which I've used to create a launch configuration:

        {
            "name": "Launch currently open script",
            "type": "php",
            "request": "launch",
            "program": "${file}",
            "cwd": "${fileDirname}",
            "port": 9000
        }

[vrubezhny]

Well, I can start the felixfbecker.php-debug extension and the degugger works on my simple test php file:

But in order to make it possible I had to modify the package.json of the extension by adding "main": "./out/extension", attribute into it.
The problem is that the original extension doesn't have neither main attribute in its package.json, nor the extension.js file, and, as such, it is loaded, but never activated in Theia.

[davidwindell]

@vrubezhny I'd appreciate your input on #15740 if you have a moment