Drupalpod support for Commerce

[NikLP]

This PR adds drupalpod support to Commerce. It is not thoroughly tested but should just work!

This is based off the commerce kickstart project and Ofer Shaal's Drupalpod works. As a consequence, this offers all the development tools in gitpod off the bat.

You can access a test of this dev branch at: https://github.com/NikLP/commerce-kickstart-project/tree/gitpod-support

This works by automagic thanks to gitpod context URLs, see: https://www.gitpod.io/docs/introduction/learn-gitpod/context-url#branch-and-commit-contexts

Notes:

• Updated the drupalpod image (compared to drupalpod repo): drupalpod/drupalpod-gitpod-base:20240306
• Adds extra [ddev] dir and [gitpod] file to the repo, may be unwanted
• Had to add items to composer.json - likely that the demo content may be unwanted
• Have not fully checked the veracity of the plugin

"allow-plugins": {
    "php-http/discovery": true
}

"require": {
    "drupal/commerce_demo": "^3.0"
}