[web-php] PR #764: Provide a release list in JSON format

Pull Request: https://github.com/php/web-php/pull/764 Author: cedric-anne I work on a company that develops an open-source application that is using PHP as its server language. Most of the time, our application is installed, by people who are unfamiliar with the PHP ecosystem, on a server whose maintenance is unfortunately often neglected. In our application installation/update process, we would like to recommend upgrading to a newer version of PHP when the server is using an unmaintained version, or a version for which a security issue has been fixed. This features requires to be able to access a list of releases that can be easilly parsed by a script. I propose to add a list of PHP releases, into JSON format, directly on www.php.net website. With current proposal, accessing /releases/releases.list.json.php would return the complete list of PHP releases, in following format: ```json [ { "version": "8.2.4", "date": "2023-03-16", "active_branch": true, "security": false }, { "version": "8.2.3", "date": "2023-02-14", "active_branch": true, "security": true }, ... { "version": "7.4.33", "date": "2022-11-03", "active_branch": false, "security": true }, ... { "version": "3.0.x (latest)", "date": "2000-10-20", "active_branch": false, "security": false } ] ```