refactor: upgrade to php 8 + enforce type declarations, code quality + style + fix some bugs
- update CI process to include quality stage (tests + code review)
- add captainhook to install git pre-commit & pre-push hooks
- remove .devcontainer Dockerfile to use project's docker-compose services: all services can now be started automatically using vscode
- update docs/setup-development.md
Edited by Yassine Doghri