Automatically configure xhprof for xhgui, remove configuration requirements, fixes #33, fixes #30

[rfay]

The Issue

• Automate Drupal setup #33
• Consider automating manual setup  #30

How This PR Solves The Issue

• Install perftools/php-profiler globally using custom Dockerfile
• Load the profiler using the xhprof_prepend.php override
• Update the README to remove the configuration requirements

Manual Testing Instructions

Install with

ddev add-on get https://github.com/rfay/ddev-xhgui/tarball/20250102_autoconfig_php_profiler

Try it out in several environments.

The new rendered readme is at https://github.com/ddev/ddev-xhgui/blob/196d4a9de5ea4e42d0b8ea8d337cd48cb572e9d2/README.md

Automated Testing Overview

Related Issue Link(s)

Release/Deployment Notes

[stasadev]

I tested it using a custom PHP project, and with simple Laravel, it worked for me.
And I noticed a small problem with the working_dir.

[stasadev]

Looks good to me.

[rfay]

Rebased.

[tyler36]

Great work!

• Cleans up and clears up so much documentation and automates installation.
• Makes Automate Drupal setup #33 obsolete.

Tested on:

• Laravel 11
• Drupal 11
• CakePHP 5